noun: a rather large collection of nubs in a body of water, most commonly but not exclusive to, above ground pools.
my 22 year old brother, who still lives at home, went swimming with his fat damn bitch, thus dubbed (after extensive brainstorming) the tsunubi.
Eric: d00d ur br0t43r iz such a nub
Tyler's nub brother: zlolz u guyz wanna go a'swimmin?!?!?!!!111!p!!18===D~~~!!!111
*both eric and tyler look at each other with looks of exasperation exclaiming in unison "pfff, nub"*