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1.
LARP stands for Live Action Role Playing

A LARP kiss is one given while doing LARP
Bethany gave Sydney a L.A.R.P. kiss since their characters are lovers.
by buttmunchkin October 28, 2005
 
2.
When someone is asleep, and you are to put your tongue into thier ear.
"Jessica just gave Mark a L.A.R.P. kiss."
by STONE2 September 27, 2005