A kiss on the lips. Can range anywhere from chaste to full on making-out. Can be used as both a noun and a verb.
Bryce: "Did you marshmallow him last night?"

Sarah: "Of course. Mike's marshmallows are amazing."
by Fallen Rose May 25, 2011
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An excessively overweight white male who is stood up for by other arrogent overweight white persons in society dispite the fact that he is hated by all other people. A fat white boy.
Hey Timmy! Get out of here you fucking marshmallow!
by JSquared May 14, 2006
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A fat, hideous gay male with rosy cheeks and a stereotypically high-pitched voice. Often inexplicably dating an attractive gay male.
Person 1: "Hey, look at that hot guy!"

Person 2: "Of course, he is with a marshmallow. I wish I was ugly and fat enough to be with him!"
by Al & Dev November 14, 2008
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Someone who is not tough (which is a punk)
You are a marshmallow for beating up on a little kid and not beating up on someone your size.
by MelDaGoat August 20, 2022
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Along the lines of cannibalism, marshmallowism is what occurs when Peeps roast marshmallows by a campfire.
Chick Peep: What are you doing?
Bunny Peep: I'm roasting marshmallows by this rockin' campfire.
Chick Peep: Dude, you're a peep. That's so totally marshmallowism.
by WWJG54487213657 December 30, 2011
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A person who is a shmexy turtle and goes to a gay school. He cheats on all of his many boyfriends. Super sketchy and walks around with his hood always on. Despite that, hes a good fried to have. He casually has 70 chocolate bars in his never clean room.
Elisheva: Hey look at the new kid.
Yael: Hes such a-
Elisheva and Yael: MARSHMALLOW!!!!!!!
Yael:... you think hed give us some chocolate?
by Yair and Eli March 6, 2018
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A safety word used while having amazing sex. Instead of saying "no" or "stop" in the heat of the moment, the other person can disregard it and use this word.
After she got off the plane we went for a few drinks then back to my place. Things got out of control and she started to see orgasmic light, she needed a break and yelled out MARSHMALLOW!
by Partymunkay September 10, 2011
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