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1.
A personal firearm, such as an automatic handgun, with a magazine that has a capacity of 10 rounds or greater (i.e. high-capacity or "high cap" magazine). These weapons were illegal to sell in the US from 1994-2004, as a result of the Federal Assault Weapons Ban. They remain illegal in California, Hawaii, Massachusetts and New York.
1) And niggas always gotta high-cap
Showin' all his boys how he shot 'em
But real gangsta-ass niggas don't flex nuts
Cuz real gangsta-ass niggas know they got 'em

- Geto Boys, "Damn it Feels Good to be a Gangster"

2) Gangsta #1: Damn holmes, you could take on the whole 5-0 with that high-cap GLOCK!

Gangsta #2: Word.
by naborsG December 28, 2005
 
2.
frontin, hatin

can also be used as high-cappin
Jim: "That is the ugliest shirt I have ever seen."
Jay: "Dude, this is custom-made. Why you high-cappin, son?"
by Jack Aces September 06, 2011