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1.
A term used to describe someone who moves from boy or girl to boy to boy to boy constantly. Basically, someone who likes a new person every week.
Tina is leap frogging; She liked Tim yesterday, and now she's all over Mike!
by Faithful! March 14, 2011
 
2.
The act during gay sex where a man has inetrcourse with another until the point of orgasm, and then quickly pulls it out and rams it inside another man.
Shawn and Anthony were leapfrogging with Nick Moore last night.
by Nickolaus May 13, 2006