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A Jello Leggo basically means someone that looses a ton of wait but only in there legs leaving alot of extra skin disgusting to look at
Guy1- damn our teacher is a jello leggo

Guy2- I know all that extra skin hanging out of those short shorts ewww

Teacher- boys do you like my legs?

Guy2- No....
Teacher- Detention
by C@D3 July 11, 2011
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