The start of an erection when making out, specifically at the fraction of 15/64, the male's brain enters a new realm
by JaneTheVirgin1130 December 6, 2016

the act of a live saliva mixing machine. just that the participants are you and some other hot mess getting some tongue action.
by robinscherbatskyhimym August 7, 2015

Adam: I have mono.
Eva: We can't trade saliva.
Adam: That sucks....
Eva: ....Then that means.. It's...
Adam: What?
Eva: MONO MAKE-OUT TIME!!!!!!!!!!!!!
Adam: YAY! Thats a super idea.
Eva: We can't trade saliva.
Adam: That sucks....
Eva: ....Then that means.. It's...
Adam: What?
Eva: MONO MAKE-OUT TIME!!!!!!!!!!!!!
Adam: YAY! Thats a super idea.
by Mono Boy August 24, 2008

Made-up holiday from Youtuber, Prank Invasion. The video has Chris, (Prank Invasion), kissing moms with their children present
What up invaders! Today I'm here in Venice Beach for Mommy Make Out Day!
Yo, its mommy make out day gonna kiss that mom now.
Yo, its mommy make out day gonna kiss that mom now.
by MildlyAdequate May 24, 2017

by Enrique December 25, 2004

When two persons are tired of their unkept anger towards each other and decided to make amends with a hot make out session!
Matt: Clara, I've been thinking about how dumb our fight was, I really thin-
Clara: Oh Matt, let's just make up and make out.
Matt: yahoooo!
Or
Juan: Oh Keith, how much I have missed you! I'm so sorry for our fights! I want nothing more than to cuddle and love you again.
Keith: oh man Juan, let's make up and make out!
Clara: Oh Matt, let's just make up and make out.
Matt: yahoooo!
Or
Juan: Oh Keith, how much I have missed you! I'm so sorry for our fights! I want nothing more than to cuddle and love you again.
Keith: oh man Juan, let's make up and make out!
by Blacksheep November 22, 2015

Rapper XXXTENTACION has the phrase "MAKE OUT HILL" on his Instagram page. My speculation is probably him wanting to MAKE OUT HELL. As you may know X had many tough times in his life and career. His goal was to evolve and become a better person, to 'MAKE OUT HELL.'
by Suckmyahh July 26, 2018
