To go crazy wild and unfathomably insane!
(this includes but is not limited to a sexual frenzy)
A spawn of drunktardiness, legend says this word was originally created by a drunktard, and widely adopted since then.
Brandon: Aaaaaahahaahaaa... *stumbles* Man you are CRAZY! You are going fucking BUCKNUTTY!! You know what I mean when I say bucknutty, doncha?
Lane: Nope, I really have no clue.
Brandon: Like those COWBOYS, buckin their broncos and BUSTIN THEIR NUTTYS!!! AaAaaahahahhaaaa!!!
Dave: Holy shit dude, that goth girl from math class is a FREAK in bed. I went totally bucknutty with her. I didn't know I had it in me!!
Kevin: Let me take your picture and frame it.