Snerpen (verb)
odd sounds, result of imperfect technique (e.g. excessive pressure on the bag), &c.
Translation of Scottish "to skirl": to sound shrill like a bagpipe; NB: ➺ Skirl.
Bruggencate, K. ten: Engels woordenboek, I: Engels-Nederlands. Groningen, 1973 (17/6) (skirl)