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1.
British Geordie slag.

To have a look.
"Giz a gleg"

"Have a gleg at that"
by Mike Scott January 28, 2005
 
2.
(v. tr. glegs, glegged, glegging)
To review the attributes of (esp. young) ladies
Let's go out and gleg birds
by Bennett July 02, 2003
 
3.
Geordie slang for spectacles
oh where's me glegs?
by tell tale July 13, 2012