stuff it

funny stuff

Irregular, often illegal, activities.

hot stuff

An attractive person. (often used as a come-on or pickup line)

made of sterner stuff

strong and determined (especially more so than someone else, to whom one is being compared).

strut one's stuff

To behave or perform in a showy or ostentatious manner, as if to impress others; to show off.

stuff one's face

To eat excessively.

stuff the ballot box

To commit fraud in an election by depositing extra or otherwise illegitimate ballots into the container holding the ballots of voters, in an attempt to secure victory for a particular candidate or outcome.

stuff you

Used in place of fuck you.

sweat the small stuff

To worry about petty issues or insignificant matters.