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1.
A useless, worthless idiot.
Jimmy is a yuckle, he doesn't know his ass from a hole in the ground.
by nowayjoe January 22, 2009
 
2.
When something is gross but it still makes you laugh or chuckle.
That joke about your mom and the donkey was sick but it still made me yuckle.
by thefirstorganism May 23, 2011