sweetcorn alley
shagging a bird or bloke up the arse and ending up with a piece of sweetcorn under the foreskin. (nb see gibo).
Bird : "fucking hell you have a cheesy knob jolly green giant."
Gibo : "no it's sweetcorn ally from last night, how's your arse after last night?"
Gibo : "no it's sweetcorn ally from last night, how's your arse after last night?"