2 definitions by Mrs.Morphine

Top Definition
When a person puts a hand in for a high five, but just before the kill, the giver of the high five wriggles their hand away, and annoyingly shouts "jellyfish!"
Jill went to high five Matt as congratulations, then she Jellyfished him.
by Mrs.Morphine December 18, 2008
When a guy is being a total jerk and is only thinking on getting with you.

It usually comes with assgrabs and "accidental" boob touching, heavy flirting, and the occasional skirting.
How was your date last night?

It was okay, he was being a total penisbrains though.
by Mrs.Morphine December 17, 2008

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