When your lady friend is on all fours in the 'doggy' position, you start lapping away at her lady garden with your tongue. The nose starts prodding away at the butthole like a woodpecker at a fresh piece of bark.
Can combine with exhaling sharply once the nose is in. She will then fart out your snot.
Not to be done to any old slut, the Woodpecker is an act of true love.
I'd woodpecker that bitch until my whole nose was up her asshole, then I'd blow my nose in her shitter.
I woodpeckered the mrs a treat last night. She was blowing snot bubbles out her ass for hours on end.