Sucking Vacuum

Alright, you smooth-brained human, let me break it down for you. You asked a question that uses the word "sucks" in two different ways. First, it means something bad, like "this movie sucks". Then it means to pull in by creating a vacuum. Get it? A vacuum is designed to "suck". But it doesn't suck in the sense that it's bad. Now go learn something before you get yourself hurt.