Verb, used to describe an individual that can't help by make bad jokes (usually a PUN).
Usually these PUNs are meant to be dumb, and quite often deliberately lame. A Punster favors bad play on word jokes but is not limited to play on word jokes. Lame humor (see anti joke and dad joke) would also fit the character of a Punster.
Punster: *walks on stage and points to (electronic) speaker* "Friends I'd like to introduce our guest speaker"
Audience: *fake laugh* "Get on with the demo"
Punster: *points to mic* "And his friend Mike"
Audience: *Booing noise* "Get of the stage Punster!"
Punster: *smirk* "Wow the 'feedback' here is terrible."
Audience: *Boo* "Get out!"
A zefron poster makes a boss horcrux in AVPM. It is also one Harry Potter, Ron Weasly, Dumbledore and one Draco Malfoy's favorite chistmatic humanitaian. It is deeply rivaled by umbridges talor launtner poster.
Ron: THAT IS A BOSS ZEFRON POSTER!
and....
Dumby: He just seems like such a chistmatic humanitaian
and....
Ron: Let's take this bit of garbage down! (atempts to take Talor Launtner)
Novice: When I first examined him I felt oddly unwell. I would never have expected such a well presented gentleman to have posterior funk.
Senior: I think you mean posterior flank!
Poster commonly designed for use in schools and offices that generally consist of a photograph centered in a rectangular frame with black background, a title in large text and a description in smaller text.
This kind of poster has been repeatedly parodied and it's a common meme along imageboards.