fatchelorette party Share definition Flag a bachelorette party in which all participants are obese and unattractive. Hey man, wanna go to Jake Ivory's tonight? NO WAY...there's always a fatchelorette party there! fatchelorette party by 520668 January 10, 2009 0 0 Get merch Get the fatchelorette party mug. Buy Now — $32.95 See more merch