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1.
Verb. To get "handsy" after consuming a moderate amount of alcohol in a social setting, in the fashion of a middle-aged, creepy uncle.
We got a couple drinks in him, and he started with the Uncle Johning. By the end of the night, he slipped it in on a roof!
by MELKA August 16, 2010
 
2.
A Person who is extremly nosey
Go away you Uncle John
by headless7 July 19, 2011
 
3.
random person, visualised as a fat jamaican marine boilogist with pigtails, generally used when we dont know the answer to a "who" question.
"who was the 13th in line to the throne of england in the 1634?"
ans: uncle john!
by Kini July 27, 2004