A word similar to “doggo” used by people, usually people ages 12-27, to make dogs sound cuter by placing unintelligently spelled words to describe them and their nievety. Words such as this proves the low level of comedy people these days possess.
Trina: show me a cute picture
Emma: here’s my pupper doggo right here
Trina: awww
Sensible thinking person: time to die now
Pupper's meaning has came from "puppy".
it means someone who is changes his personality to be like the "cool guys", so he will be more popular, while he's not being himself, just like a puppy who licks the community's ass
Boaz came to this party just to be more popular, even that he hates parties.. he's such pupper! *looser!*