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To cruise down the street in your car with the window rolled down with you arm hanging out the window making your muscles look bigger than they actually are.
Let's go fat arm it down mendo.
Fat Arm by DaLumberjack June 18, 2008
A lesbian rower who is known to sleep with someones boy friend...also can be called ant farm or dykleznowkbi or horse face bird nose

Arm fatigue 

A bogus criticism of Trey Lance the 49ers probably will use to keep Jimmy Garoppolo on the roster for one more season just so they can get a third-round comp pick for him in 2024.
"Trey Lance gets arm fatigue sometimes after he throws, so we'll tell people that's why we're keeping Jimmy Garoppolo as a $27 million backup when really we just love comp picks."

speedbag armfat 

It's when a fat person's triceps area is so fat it looks like a boxing speedbag.
That chick is so big I want to punch her speedbag armfat.
speedbag armfat by Kt nola February 26, 2024