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1.
British Naval lingo for marines, IE "GROund POunders." Same contraction also used in the science fiction series Babylon 5: GroPos; Ground Pounders.

Also the name of a KAOS robot from the 1960's television series Get Smart
Gropo has nothing... zero to do with 'groping'.
by gropo February 01, 2009
 
2.
Slang for Ground Pounders, meaning infantry.
I'm going to join the army and become one of the Gropos.

Why not the Air Force?

I like going out on patrol and be alongside my fellow man.
by SsurebreC November 20, 2009
 
3.
kind of like groping, or stroking. or just touching sexually.

a man or a woman who looks like they might rape you.

"what a gropo man. hurry run away fast!"

"in moulin rouge, the duke and his hat. he was groping his hat. so he's a gropo."
by SsSsSarah August 11, 2006