A word used to call someone dumb, a party pooper, no fun etc.
For example, if you are down in the dumps, you're a dooper. If you're being mean, you're a dooper. If you're a snitch who ruined someones first time, you're a dooper. If you don't know what another person is talking about, you're a dooper.
"C'mon Brian, don't be such a dooper!"
"Wow, that girl is such a dooper."
Someone who is stupid, dumb, annoying, or has an unpleasant personality in general.
"Don't be such a dooper, ya foob!"
"Sorry, I don't associate with foobs."
A word used to replace adjectives in a conversation for comedic effect, or used to replace adjectives with the intent of insulting the reader or using an insulting word.
"What the doop is going on here?"
"Like doop, what's her problem?"