girl 1: what did you do last night [yesterday]?  girl 2: i made up a horns on a cow [horns on the cow] with benji and bob
it is a slang term used in essex to mean when you make up a crazy [mad], random [spontaneous] song [lyrics] with your mates [friends]
"girl 1: what did you do last night [yesterday]?  girl 2: i made up a horns on a cow [horns on the cow] with benji and bob" What is the definition of "horns on a cow [horns on the cow]"?