Jizz paper
Jizz paper is when you're using watercolour paints on paper unsuitable for watercolour painting or if you overwork the paper itself, resulting in a crusty wet mess of a page that resembles dried up jizz in a pair of underwear you've forgotten to wash.
Person A "ah damn I was trying to watercolour paint but it just resulted in jizz paper"
Person b "that's a shame, you'll get used to working with watercolours eventually it just takes practice"
Person b "that's a shame, you'll get used to working with watercolours eventually it just takes practice"