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1.
When you ejaculate on a girls face after she asked you not to and ask "why so serious"
My girl ate the last piece of chicken after she knew i wanted it, so when i was getting some head that night I pulled out and gave her a joker
by therealdicktracy January 20, 2012
 
2.
A person that plays jokes/teases others, usually the most gullible.
he's such a joker (he was just joking)
by Billy Jhonson July 09, 2014