Means a bi-sexual puff who denies all knowledge of being gay. Also can be used at an insult towards tall, mop-headed bastards.
phoebe:ryan you're so gay !
ryan:no im not !
phoebe:oh you're such a hupplefunk !
a nickname for the air cadets, given by the army cadets.
Phoebe:"Oh my God, look how gay those air fairies look! I'm so glad I'm in the army cadets!"