The first two are from a MAD magazine that would be worth some serious coin if I'd thought to hang on to the damn things back in those days. As far as I know, the rest are Warpy originals. In no particular order, new entries to the Sports Dictionary are:
Agnew: to suddenly change directions without warning. [e.g. the ball agnewed and hit him in the face.]
Plimpton: to poorly imitate something that is well done by others.
Kerry: to waffle or flip-flop multiple times. [e.g. Alexi Casilla wasn't sure whether to start a double play at second or get the lead runner at home, so he kerryed on the play and everyone was safe.]
Favre: to agnew or kerry, but with considerably more drama and media coverage. [see also: Obama, Ventura]
Wie-Wie: to make an error that even toddlers in potty training would not make. [e.g. I would've won the tournament if I hadn't wie-wied my score card.] [note: not to be confused with Wie-In.]
Wie-In: to gain entry into something for which a person is otherwise unqualified. [e.g. being a past champion got Darrell Waltrip a wie-in to many races.]