Dic: guns (as a meaning of arms or muscles)

arms, esp. very muscular ones: I could totally kick some ass, check out my guns.

Really huge muscles. commonly used as for body builders and football players. also used for people who think they got big muscles but really don't.

Word used by bodybuilders when speaking of the biceps muscles. Could also refer to the whole arm, but this is normally not the case. SYN: Gunz

the male arm, usually bicep, usually large: That guy has the biggest guns I have ever seen!

really big muscles that when flexed, have a nice curve to it: Darien has some bangin guns. I just want him to flex them all day.

.... Urban Dictionary