A couple from Chicago, Marcus, and Emily are on a week-long vacation in Mexico. Marcus wants to propose to Emily but his plans are ruined by a  leaking Jacuzzi. While arranging anything, a hotel employee accidentally disclosed Marcus’s plan and he had to propose to Emily in the hotel’s lobby.

Another wild couple Ron and Kyla who are staying in the same hotel invite Marcus and Emily to spend T week together.  And the four spend their vacation together. While they were celebrating Ron and Kyla inspired them to be carefree and due to excessive drinking they both blackout. Marcus retrieves his consciousness during what appears to be Kyla having sex with him. Emily remembers nothing from this last night, Marcus agrees.

At the airport, they bumped into each other. Ron and Kyla show that they four are now a part of each other’s life but Marcus believes Ron and Kyla are too uncertain to have a friendship with them. Marcus and Emily attend their official wedding in Atlanta arranged by Emily’s parents, Harold and Suzanne. The brother doesn’t like Marcus much after he punches Emily’s brother Gabe. Insisting the marriage will be as close as possible, preventing Marcus from inviting his friends and colleagues, they hold a huge event.

The night before the wedding Ron and Kyla adequately appear driving a truck through the gate. And tell them that they are not in contact with them after the vacation. Harold begins to be infuriated at the intrusion, but after knowing that Ron and Harold are both former Green Berets the two strike up a friendship. Ron and Kyla swiftly attract Emily’s family members. Kyla reveals that she is pregnant and Marcus is directly involved in the pregnancy. After unwillingly eating the hallucinogenic mushrooms given by Ron, he speaks to Harold on Marcus’s behalf, concealing the drugged state and giving him another chance.

Marcus selects Ron to be his best man and trusts him with the rings. The next day men go golfing, where Marcus and Ron play foursome with Gabe and his friend Bennet. Ron suggests betting on the game and Gave agrees. Through the halfway, Ron and Marcus begin to lose. Rom reveals that he bankrolled the wagers by pawning the wedding rings. Ron makes a huge bet, that he can hit the 18th green in a single stroke. Though he was looking the wrong green. And forcing him to make a 375 yard shot to win.

Ron accidentally causes Marcus to drop the rings in the sewer grate. Ron revealed when Marcus chokes him in anger that the doctor is infertile and repeated that Kyla got pregnant because of Marcus. At the rehearsal dinner, Kyla seems to announce that Marcus is the father of the child. Marcus interrupts and Hares the story that he believes happened in Mexico. Emily and Kyla were the ones who had sex, he also reveals that he lost the ring and a fight follows between Emily’s family and Marcus’s friends.

Emily finds out that Kyla has been giving her grandmother Phyllis homeopathic pills. Emily and Marcus urge them to leave. Marcus’ coworker discloses that they reform with Harold. Harold comes to respect him as a businessman as well as a person. Marcus believes that indirectly Ron harmonizes.

Phyllis received a gift from Kyle and a letter in it that says that Ron lost his previous best friend Charlie and his relationship with Marcus helped him recover. The gift is the wedding rings. Emily and Marcus realize they made a mistake sending them away, they convince Ron and Kyle to return to the wedding and Kyle reveals that they are planning to get married.