The act of wearing pants without underwear, allowing your balls to hang freely

To move furniture (or other heavy items) without the use of machine aid.

When a guy doesn't wear anything underneath his pants/trousers/shorts and he is letting himself hang loose.

for a man to wear his pants/shorts without any unserwear on

walkin' around, usually in shorts, without underwear on. often sung along with, and popularized by, the tom petty song 'free falling'

When one wears no underwear beneath his trousers
e.g Did you see Steves arse, he was free balling so hard.

Or, In the sport of cricket one is said to "free ball" when they wear no box (protects genitals) whilst batting.

a Male individual who wears no underwear