Top Definition
When two or more participants take turns playing youtube videos to each other, purposefully trying to outdo the last video each time
'Yo Harry and me were youtube soundclashing till the early hours last night, I well murked him with that Michael Jackson video'

also

'hey Pete that video's funny, but have you seen this one before'
'oh, it's on! the Youtube Soundclash is on!'
by Capo 'ladies choice' Ultra July 06, 2009

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