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1.
The sound you make when you are punched in the throat.
"Hey, look at that bastard. You should go punch him in the throat."
*punch
"Gelk!"
by Lord of Blasphemic Juices March 04, 2009
 
2.
1. The name a member of the human race such as george w bush would go by.

2. idiot

3. twat
Bobbie Hall, you are such a gelk.
Just fuck off you fucking gelk.
by Jose Fernandez May 15, 2008