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1.
After sustaining an injury to a leg, knee, foot, ect. the limp required is known as a gangsta walk.
"What's with the gangsta walk?"

"I have the gnarliest gangsta walk after busting my knee yesterday"
by Word Burglar December 31, 2009
 
2.
A type of hip-hop dance, originating in the Southern United states, that involves slamming into and pushing off of other people on the dance floor, to music commonly described as crunk.
Lil Jon has many songs that are gangsta walked to.

Man we up in tha club gangsta walkin till 3 in the mornin
by Iceman28 November 19, 2006