In PNG, we had "Obscene Airways" collectively known as
P2-COC, P2-BOX and P2_TIT. Italy has an I-Fu*k (Honest)
and the UK has a few that slipped thro the net ... G-ONAD, as has been spotted, was one. G-BOLX (C172) was another.
No doubt, the spottas amongst you, will have a few more.
Oh, yes G-ROWL a pup from memory.....could be wrong.