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3.
While performing cunnilingus, the vagina is blown into, loading it up with a pocket of air. The performing party then grabs the woman's ankles and separates them in a manner resembling holding the handle bars of a low-rider motorcycle. The resulting queefs resemble the sound of a chopper.

Additionally, the ankles can be twisted for that extra bit of immersion.
Dom's mom loves the west coast chopper. Especially from Nick.
by Schlongo December 28, 2004
 
1.
An offensive insult made toward a Portuguese person.

The "West Coast" part refers to the fact that Pork-chops come from the west coast of Europe.

The "Chopper" part is short for pork-chop, another derogatory term towards Portuguese people.
Jerome: Hey Oscar
Oscar: What up?
Jerome: Fuck you, you fucking West Coast Chopper piece of shit!
Oscar: Shut the fuck up nigger!
by Kikey January 31, 2009
 
2.
Company owned by Jesse James to produce custom choppers. Very famous pop culture brand these days.
Tyson owns a custom bike from West Coast Choppers
by Denis Baldwin June 03, 2004