Top definition
The residual build in your arse crack after to many wet farts. Grey/brown in colour and always moist

Often used when swearing, normally accompanied by knob cheese
"arse butter this computer is total knob cheese"

"hey if you add some arse biscuits you've got yourself a meal"
by Topher Down March 27, 2009
Get the mug
Get a Arse Butter mug for your barber Riley.