willy bum sex

Best definition
willy bum sex
An altogether more accurate term for ‘bum sex’, as there are actually willies involved in it, as these authors well know. It also undergoes frequent use as a rudey exclamation of horror, when something very bad or irritating happens.
‘Rachel likes to have willy bum sex with boys.’

‘Kate has willy bum sex five times a day.’

‘OH WILLY BUM SEX, i forgot the biscuits :(‘