I find it somewhat vindicating that within days of this post, apparently some people at either AMEX or multiple broadcasters also decided that this commercial was in questionable taste at best, and stopped airing it.

...and those peanut people have changed their commercial to saying "nut snack" instead of talking about selling you a might fine nut sack. So, if you thought you were hearing this before and are thinking you didn't now, yes they were in fact using the slang for a scrotum for several days.

RE: American Express's New, Especially Insane Commercial