sybdi

Acronym.
Smash Your Back Doors In.

Originated in Suffolk with the Rosey Posey Rainbow Unicorn man. Now in common use with Anglians around the country.

Used as a note of endearment or one-upmanship.

"Love you, cuntface. Sybdi."
"I win! SYBDI!"

by C. Shells November 30, 2013