A creepy somebody, An odd or disgusting situation.
"watch out for that icky man" i.e not looking too great, watch out for him, he smells milky. usually used to generalize someone who is misunderstood, odd or is thought to be a pedophile in Lancashire. Usually a homeless person, ice cream man (that is too friendly) e.t.c
Or. you spilled milk on my pant's, "that's icky"