Top Definition
when a girl has an orgasm that is similar to smashing a watermelon over her head
Yo, howd it go last night. . . . . .
Bro, i brought that girl back to my place and served her a gallagasm........Yah, she was knocked out with juices dripping everywhere
by Gallagopher August 19, 2007
5 Words related to Gallagasm

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