[ExI] usage question

[Stefano Vaj]

On Sat, Jul 25, 2009 at 11:41 PM, Damien Broderick <thespike at satx.rr.com> wrote:
> Okay, it was a "Yo mama" barb. Which obviously hasn't got anything to do with the cop's actual mother, any more than if he'd been called a motherfucker.

Isn't the latter in US English an insulting reference to alleged
incestuous habits of the person addressed by the speaker? :-/

--
Stefano Vaj