From Wiktionary, the free dictionary
man-arm (plural man-arms)
- (informal, usually derogatory) A strong, manly woman's arm.
2002 September 24, Caryperk39, “Re: Katie Couric's Man Arms”, in alt.fashion[1] (Usenet), message-ID <20020924153734.03011.00008036@mb-dh.aol.com>:[…] what the heck do [celebrities] care if someone thinks they have man-arms? I am not a fan of man-arms. I prefer a feminine look, more like Jennifer Aniston, who is well-toned, but looks like a woman.
2006, “Scott Pilgrim & the Infinite Sadness”, in Scott Pilgrim, volume 3:[Ramona threatens to hit Envy with a large sledgehammer.]
Envy: Wow, Ramona, isn't this kind of unfair? One swing of your burly man-arms and my little head is pasta salad.
