Just more useless slang for an asshole.
Anon : hey, did you know anon's such a London snake hole?
When your partner attempts to kiss you and so you stick out your tongue, similar to a snake, and thrust it into their mouth.
My girlfriend was leaning in to kiss me, so to mess with her I gave her the ol' Norwegian snake hole.
When someone abruptly shoves their fist through your armpit indicating how much they would love to fist the hell out of your man vagina until you scream rape.
Man 1: What a great day. Guy 2 snakes guy 1's hole. Guy 1: take that bitch. Guy 2: god damn it not again. STOP SNAKING THE HOLE BLAKE.