What is spalsh?

a strange creature, originating from seaham, a land of fish and not much else, who enjoys looking up slang at 23.33 on a sunday evening

woa, dat guy is such a spalsh, he must b from seaham!

spalsh - meme gif

Something that is less than excellent. Not horrible, but not great. Could be better.

I am having a spalsh day.
I could have done that report better, but I spalshed it to get it out on time.