A person, or character in a movie, novel or video game, who is full of hot air and/or is weak.
Person A: John's a real marshmallow

Person B: You mean he is a confectionery treat?

Person A: Nah. He is full of hot air and so weak, one hit is all it takes to bring him down.
by Alexander Drummond January 21, 2016
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fluffy sugury little squares of heaven. best fuckin candy in the world. i could eat these little fuckers all day and never get sick...

i hope i turn into one someday so i can eat myself...
If i eat too many marshmallows, maybe i'll turn into one...
COOL!
by your lord and master April 01, 2005
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when you have a crush on someone and you don't want to say there name in public.
"oh look, marshmallow is over there!"
by char2304 December 01, 2016
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A soft dick. usually when after having sex one's dick become soft.
Girl: do you want to have it again.
Guy: No, sorry. I already got a marshmallow
by little boy89 October 26, 2011
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the slang word for paraphimosis, or the condition of the male foreskin becoming trapped behind the knob and swelling up, giving the appearance of a marshmallow.
oi sarah gave me a hand job the other day, i looked at it after and turned out she gave me a marshmallow as well.
by marshmallow mick September 25, 2010
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a fat white girl who is puffy and overweight hence a marshmallow
dat brawd is a fuggin marshmallow
by Kwelityhiphop November 28, 2005
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