The heavyset version of a rockabilly girl or guy.
'chicks think it's OK, to have their front butt and back fat hanging out of their ripped up Horrorpops shirt.'
Could also be used interchangeably with Psychobilly.
Term coined by Tony "Black Spade" Palacio in 2000.
"Hey man, that fat chick isn't rockabilly, she's a ROCKABELLY!!!"