Things that people don't give, when they don't care about something

1) a fuck
2) a flying fuck
3) a shit
4) two shits
5) a crap
5) a damn
6) a goddamn
7) a tinker's damn
8) a rat's ass
9) a monkey's (toss)

And some less profane ones:
* a fig
* a hang
* a hoot
* a jot
* a rip