Shit = a vulgar word used in many ways
Shit (verb) = to expel feces from the body (to poop)
Ex: Where is your bathroom? I have to shit.
Ex: When I saw the bear, I nearly shit my pants.
Shit (noun) = feces (poop)
Ex: What is that horrible smell? It smells like shit.
Ex: I think I stepped in dog shit.
Shitty (adjective) = bad, not good
Ex: That was a shitty movie. I hated it.
Ex: He is a shitty person. He is rude to everyone.
Shit! (exclamation) = anger or frustration
Ex: Oh shit! I forgot my wallet.
Ex: My car has no more gas. Shit!
__ like shit = is/was horrible
Ex: The baseball player played like shit.
Ex: The food tastes like shit.
Bullshit = I don't believe you; something is untrue or unfair
Ex: The story about Santa Claus is bullshit. It's not a true story.
Ex: I can't believe the prices are so high. It's bullshit.
Holy shit = surprise; I can't believe it
Ex: Holy shit! We won the game.
Ex: Holy shit! I just saw a shooting star.
__ is the shit (modern, positive) = really cool; really great
Ex: This video game is the shit. I could play it all day.
Ex: Michael Jordan was the shit at basketball. He could beat anyone.