Why do people say "it sucks" or "it blows"

They all mean givin head though...

Yeah, I never got that either.

Why do people say your the shit? Lol because shit is just nasty ha ha

Sucks means something is bad quality
Blows means it's boring or stupid

That is because somne teenagers said it and liked it because the rents didn't know what they ment, and it caught on.

it's normal, I say it all the time.

i think its completely normal

They say it because you suck or blow a dick (don't ask me y that's a bad thing)

I think they mean the same thing. Both mean that something is terrible. Literally, they both are about sucking cock, but it's more common for them to be used in the first context.

I mean lyk "this movies suks" and "this movie blows" meanin its borin

Suck me and blow me mean different things

I say both of them cuz I'm cool like dat mayne.