muller, v. — Green’s Dictionary of Slang

muller v.

also mullah

[SE mull, to grind to powder, to pulverize, to crumble]

1. (orig. UK prison) to beat up severely.

1997

N. Barlay Curvy Lovebox 31: You fuckin’ cunt I’ll muller ya.

2. to defeat resoundingly.

1999		Parry & Azulay Arsenal World 26 Nov. 🌐 Our overall performance was so sluggish and casual, that one could have been forgiven for thinking it was a different side, to the one that mullahed Middlesborough on Saturday.
2001		lutonfc.com Apr. 🌐 I thought we absolutely mullered them today. I thought it was a completely one-sided game.
2016		Guardian Sport 10 Dec. 🌐 For some strange reason, Jadeja is not overwhelmed by fear and absolutely mullers the second ball over midwicket for six.