To
french-kiss, kiss with tongue, snog, pash, etc. Often doubled (lep-lep) to mean "have sex with", or used as an adjective (lep-able) to describe someone good looking.
It comes from the word leap, with the idea being that you jumped on someone -> leaped someone -> lepped someone
Areas used:
Ireland and Northern
Ireland
Ruth: Did
ya lep him last night?
Lisa: Yeah, but we didn't lep-lep or anything
Ruth: Why, do you not think he'
s leppable?
Lisa: Yeah, he'
s leppable, but I've just met him. Soon though!
Ruth: Lucky thing - I'm dying for a lep-lep