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1.
Pronounced "fya powa"
The quality of having built or swole arms. Arms (or specifically biceps) are sometimes known as "guns" so to have strong/muscular ones equates to having "firepower."

As heard in Night at the Museum 2.
Check out the gunshow over here, *flexes each arm* Boom, Boom, FIREPOWER! (FYAPOWAAA!)
by Jickens June 29, 2009
9 1
 
2.
also; fyapowa
derived an ability provided by a plant found in the Super Mario Bros. video game for the NES

1) n. potent marijuana
2) n. to have the skill to perform consistently well at anything, similar to having game
1) "Aww shit son! This be some firepower!"
2) "Damn, you beat me again."
"Hell yeah! I got firepower!"
by dollabillzyo November 07, 2007
4 0