When fingering your sex partner insert bird finger into the anus then remove it and flick off the world as if your on top. Your shitty bird finger is now called the dirty bird.
A famous motorcycle shop owned by John Shope and located in Phoenix, AZ. Dirty Bird Concepts has won several awards including Chopped Bagger Best of Show, Buffalo Chip Supreme Sturgis Showdown (as seen on Biker Battleground) and won the title of Grand Champion Winner in the Baggers Invitational Bike Build-Off 2014, 2015 and 2016. To top it all off, in 2015 John received the greatest honor of all; he was inducted into the Sturgis Motorcycle Museum and Hall of Fame.