British slang,
1. To get beaten physically - as in a fight.
2. To get wasted - as in booze/drugs.
1. "We totally got mullared by West Ham supporters while walking to the station after the match."
2. "I went to the pub and ended up getting totally mullared with my friends."
While standing next to a mullet wearer,being smacked in the face by the ape drape when the proud owner suddenly and unexpectedly turns their head and the flowing mane acts as whip.Some mullet wearers have actually refined this phenomenon into an offensive and defensive tactical weapon.
At monster truck rallies,it is prudent to leave a vacant seat on either side of yourself to avoid being mullashed.