When you ejaculate into your hand and slap somebody else with the hand you ejaculated into across the face.
"If you dont stfu im going to J-Slap you."
"Dude Amanda didnt shut the fuck up last night so i had to J-Slap her."
"Dude Amanda didnt shut the fuck up last night so i had to J-Slap her."
by CowNiggaBalls November 25, 2011

A j-slap is when a romantic partner licks his or her hand and slaps a girls vajayjay (vagina) to lubricate and excite their partner.
by kathom86 April 06, 2013
