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What's Donk you ask?
Donk:
A pipe/plank-sound, that is used in Bouncy/scouse house/NRG music. Hearing this sound in a piece of music, one can easily recognise the genre of music it is.
The sound is most commonly placed midway between beats, in the same place as hi-hats, but can be put in other places for different effects and such. The music it is used in is usually played between 150 and 160 Beats Per Minute.
When dancing, a donk commonly makes the dancer bounce on the donk beat.
It all started (as far as I know) with the insta-classic "Put a Donk on It" by Blackout Crew. http://www.youtube.com/watch?v=ckMvj1piK58 It's fucking infectious despite how awful it is. AND. It's popular as all hell.
Vice TV did a 5 part documentary series on it.
http://www.vbs.tv/video.php?id=12185178001
If you catch Donk fever, you may want to check out this site http://www.donkdj.com/ that allows you to upload ANY song and have it "Donked".
Have fun Donk headz!