This is a popular phrase used by those who speak ebonics (negroes). It is equivalent to "I am going to get" used by those speaking dialects other than ebonics.
Someone who uses an "imagine" insult more than once during an argument to strawman another person.
In a sentence:
You're a fucking imagitard. You can't even think of a creative or original thought you absolute bafoon.
Gamer 1: Imagine losing.
Gamer 2: I went top of the leaderboard and you got carried you brainlett.
Gamer 1: Imagine losing at the top of the leaderboard.
Gamer 2: No one likes you.
Gamer 1: Imagine being named justslappedyourmom69
justslappedyourmom69: You're an imagitard.
Someone who jumps from one relationship immediately into another one.
Serial monogamists can not stand to be alone and often suffer from vast commitment and insecurity issues.
Because they jump into relationships immediately after the previous one has ended, serial monogamists typically don't take the time to reflect on their behavior or why their previous relationships failed; thus, they end up making the same relationship mistakes over and over again.
Person 1: Damn, Dustin already has a new girlfriend?! It's only been two weeks since he broke up with his fiance! I think he's a sociopath.