When you are are a big strong human picking up dangerous creatures with your bare hands while wandering around some place with dangerous creatures, you say "yoink" while doing so to reduce resistance, and assert your dominance as the top of the food pyramid.
Ooohhh what do we have here? *yoink*, this is a beautiful native salt marsh snake! Still looking for that 20-foot burmese python though.
A term used by the one and only, Ken wood. Not having any true meaning, only shouted out at random times to announce his presence and to confirm his homosexuality