Green’s Dictionary of Slang

ween n.

also ween bucket
[weenie n.1 (5)]

(US campus) a boring, socially unappealing or unacceptable person.

[US]Eble Campus Sl. Apr. 4: ween – someone who is no fun.
Frederick (MD) Post 25 Apr. A-3: She and her friends use words such as ‘dweeble’ and ‘ween bucket’ for someone who’s ‘stupid, a jerk, anybody you don’t like,’ she said.
[US]Eble Sl. and Sociability 59: Derogatory epithets abound, for example [...] ween, wimp, wuss, and yoyo.

In phrases

queen ween (n.)

(US campus) someone who backs out of a commitment.

[US]Eble Campus Sl. Nov.
[US]Eble Sl. and Sociability 120: During 1990–92, all of the following nouns categorized someone as not attuned to the prevailing style or priorities of UNC-CH student life: [...] queen ween.