- Bullshit - Not true
- Horseshit - Nonsense
- Apeshit - Insane to the point of (almost) becoming violent
- Batshit - Insane to the point of a disconnect from reality
- Chickenshit - Cowardly
- No shit (Sherlock) - Obviously
- Holy shit - Mind-blowing / unbelievable
- Hot shit - very good
- Dipshit - Dumbass
- Tough shit - Take it or leave it
- Jack shit - Nothing
- The shit - Perfection
- Shit show - A complete mess
- Shit for brains - Stupid
- Piece of shit - Useless thing or disrespectful person
- Good shit - Thing of above-average quality
- Ratshit - Poor quality, sometimes created from salvaged parts
- Dogshit - Very poor quality
- Shitty - Thing of below-average quality
- Shit ton - Excessively large amount
- (You're) Shitting me - Disbelieve as a story is being told
- Little shit - Disrespectful (younger) person
- Oh shit - This ain't good
- Shitfaced - Drunk
- For shits and giggles - for fun
- Full of shit - liar
- Talking shit - Running his/her mouth
- Shit head - Asshole
- Cut the shit - Knock it off
- Real shit - Based. No cap. No games.
- Shit stirrer - Takes pleasure in causing trouble
- Same old shit - Nothing has changed
- Doesn't know shit - Clueless
- Ate shit - Fell down really hard
- Scared shitless - Really scared
- Shit bricks - Really scared
- Shit hit the fan - Things went down
Also my apologies for this enormous shit post.
Suggestions welcome. I'd like to create a more-or-less complete list.