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1.
The fifth finger on the hand, opposite the thumb.
Debra: Yeah, it fits snugly between my thumb and lonky.
by baroquegangsta March 19, 2008
 
2.
Being crazy or doing stupid things to get a person's attention, mainly a male getting a female's attention.
Billy is lonky, LOL.

Billy just ran into the wall wearing his boots on the wrong feet. How Lonky is that?