When someone takes a nasty, runny disusting fat shit on someone elses hair, then it dries into tentacles similar to those of a squid.
Brandon gave Anjew a squidley last night. He still hasn't washed his hair.
An uncommon British slang term meaning Quid, or to put it another way, 100 pence, 1 pound sterling.
Can I borrow a squidley, mate?
That'll be two 'an 'alf squidleys, mate.