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2.
Used as a verb: To make sure something was done right.
"Get over there and checkmark Jake's work, okay? He's new and still messes up like gangbusters."
by Shanya Almafeta April 06, 2004
 
1.
when someone's penis is bent during an erection. a slang word used to make fun of that said person.
Guy1: Dude that kid flashed me WTF???
Guy2: heh heh he has a checkmark
by Tin Cup 23 March 17, 2010
 
3.
A eupemism for dick (in terms of "giving" or "getting dick")

Can be used as verb or noun.
"Did you checkmark Erica last night?"
"I want a checkmark from that dude over there."
by Jesse February 07, 2003