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1.
A person from India or who has Indian heritage.
Where's he from? - He's ingen.
'Dude, there are too many ingens here'
by v April 02, 2005
 
2.
A slang used to describe someone who is inserting something into somewhere all the time in singapore.

Striking similarity to insert and penetrate
Hey, that's an Ingen! Look at his pants!
by Valeri July 11, 2005