"All up ons" is a colloquial usage describing popularity. "It means they really like you". It can also mean something is on, around or close to someone.
A phrase derived from a Strong Bad E-mail. It has no specific definition and it's meaning can change several times in the same paragraph.
Recently it has swept the nation as the hottest slang phrase since "where's the beef?" and "hella." One would be wise to adopt it immediatly into ones vocabulary, otherwise one might be left in the dust as a square or a narc.
As an affirmation:
"Hey, Sharice, did you take the shiznit out to the beshizzle?"
"All Upons, Tyrone."
adj. Condensed "all up ons", ascribed to a person who is shamelessly flirting with someone else, especially when the flirter is blatantly disregarding flirtee's need for personal space; being all up in the grill of the flirtee.
speaker 1: Did you see Brandon last night? He was allupons my shit!
spearker 2: Dude, I know. It must have been that hot shirt you were wearing.