pelihousut (englanniksi)

game pants (s: pair of pants or trousers used when playing a game)
rag (s)
in the colloquial idiomatic expression repiä 'pelihousunsa' which may be translated as "to lose one's rag" (s: lit. "to tear one's game pants" / colloquial: to become angry)
Sana perusmuodossa: mon