Top Definition
The unwanted spray from the urine hitting the rim of the toilet seat and going on your bare feet or legs during a late night night pee..
'Lad, had horrid night plash last night, got up at 3 this morning for a pee in my boxers, ended up having all over my thight'

'shocker mate, worst feeling, makes ur blood boil...night splash...wouldnt wish it on my worst enemy'
by Gorillamonsoon 12345 May 08, 2009

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