Slang believed to have originated in the North of England, bird turding means to talk nonsense, or to boast with nothing to back it up. Possibly derived via pigeon fanciers, telling someone that they are bird turding means that they don't have the facts and are basically talking bird shit. Telling someone that they "ain't bird turding" means that they have got it right.
"Winkies who try to aggrandise themselves using Urban Dictionary are just WOSPs."
"You ain't bird turding there, pal."
1. the present act of shitting a turd onto the bed/mattress of your boyfriend/spouse
2. the trend of girlfriends/wives shitting onto their significant other's bed or mattress
"Can you please stop Amber turding onto my bed!"
"Why the hell are you Amber turding my mattress!?"