A big, self-centered motherfucker, who also happens to be an asshole. When the two words are combined, (due to some complex limits) the included noun "hole" works to cancel out the word "
mother" and for some unknown reason, "fucker" becomes "fuck". the result is the word "fuckass" (fuhk-as).
Also, this word may be useful on a tertiary level, in the event that the person of reference is
homosexual, or in some way involved in
bum-sex, in the sense that it could describe the action of "fucking the/an ass".