Most commonly used preceeding the word 'giz' (contraction of 'give us', meaning 'Can I take a look at?' or 'Can I have?'). This is very informal english used mainly among people who know each other, and is not considered suitable for formal situations.
Giz us a geez at what you got there.
"Dude, look at Geez. He has three girls dry humping him."