The act of splintering is when a man puts his penis in between a girls armpit and masturbates. Recent polls show that more and more teens are splintering. In a recent study, 68% of sexually active teens between the age 14-16 say they have splintered before.
ex. Dude, i was splintering Seth's mom last night and Seth walked in on us!

ex. Were you splintering with Alyssa after Homecoming, because I thought I heard you all in the bathroom?
by SR, HW, and LS September 5, 2008
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A small stick of wood stuck under the skin, or pearcing the body's protection. The opposite of schlong. When referring to a girl who gets too many splinters, it is refered to as a whore or more commonly, slut.
Nat goes to the baseball games to pick up some splinters.
by Jameridith March 4, 2007
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splinter is an extremely skinny female who acts like a cunt towards others over 90 lbs. completely annoying and uncalled for.
"that splinter just called you a lard ass because you can't fit in a size 1.....what was she doing looking at your ass anyway, fucking dike."
by captchichi April 15, 2010
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When a girl is flat as a board and has no booty and is very skinny.
Guy: Fucking her would be like fucking a 2x4. You'd get a splinter.
by AreSeeCola April 23, 2015
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Named after the Sensei of the Mutant Turtles, this is the ultimate fighting machine: A rat boy trained as a ninja.
Did you see that ash tray fly? That Stuart is a fucking ninja. In fact he's Splinter.
by EmmBee February 4, 2005
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an STD made of all the current STDs combined
Frank: "Look at that girl from North Marion, daayyyummm."

Dank: "Dude, I wouldn't touch that. I heard she has splinters!"
by bwoodd November 21, 2010
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