Attributed to Sir Alex Ferguson, famed Scottish association football manager and former player referencing the sound made by moving around in a plastic seat while squirming under pressure.
squeaky bum time (uncountable)
- (informal, chiefly Britain) An exciting part of a sporting event, particularly the final moments of a close game or season.
2003 March 18, “Fergie just can't stop playing his mind games”, in Daily Express, page 62:
"It's getting tickly now - squeaky-bum time, I call it."