When a girls breasts bounce up and down when running, dancing, or doing any other sport- hence 'gym'. Often occurs when a sports bra isnt being worn but there are exceptions.
by FieKins February 25, 2010
Get the gymboob mug.A person who updates their facebook status to let their friends know that they are going to, or have been to, the gym. This is done in an attempt to make yourself look big and strong, and therefore gain friends. However, it normally makes you look like a dick.
by Joanne Kard April 19, 2011
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Harry Cox: Hey! Did you see the tits on that one Allie chick? WHEW! TELL HER TO GET THAT FINE ASS OVER HERE AND GIVE ME SOME SUGAR!!! YEEEEEEEHARDONOOOOOOOOOOOOWWWWWWWWWWW!!!
Dick Burns: She'll give you some sugar alright. You might wanna make sure she doesn't go in the sun or those gumboobs will melt.
Dick Burns: She'll give you some sugar alright. You might wanna make sure she doesn't go in the sun or those gumboobs will melt.
by Raipum Elons June 27, 2008
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