Quoted from kidfresh:And you would be wrong. Thwapp? seriously. Don't think so. Knock is closest or maybe wrap, Hence the term knocker, not thwapper. And its spelled spectrogram. Onomatopoeia coming from Oak Hill, VA is like french cuisine coming from Bentonville, Arkansas. Nice try though. Next you're going to describe the spelling of the the sound of snoring as zzzzzzzzzzhhhh. Bottomline is there is sometimes no speling for sounds heard in nature. But thwapp is not even close. Good day sir.
Wow kidfresh must be really fun at parties
Quoted from Prmailers:I would spell it thusly:
Bazinga!
lol!!
Quoted from tracelifter:It is closer to THWACK.
+1 I hear THWACK and try to get my knockers that go DUD to go Thwack!