someone you know, but do not necessarily like, but cannot seem to get rid of. a "friend" in your group that no one claims to introducing to everyone, an ex-significant other who you still have sexual relations with, or a family member that you feel obligated to invite to get togethers.
friend: "man, who invited Bob to the party?"
other friend: "not me, but someone here had to bring that Shitbird"
dude: "man, it's been a long time since i got any play, im calling what's-her-face"
other dude: "oooooooh, bootycalling the Shitbird!"
uncle: "you know we don't approve of your brother and his 'wife'. why did you bring them to my party?"
nephew: "it's not my fault, he saw me making the beer run, i had no idea i was going to be Shitbirding today!"
other friend: "not me, but someone here had to bring that Shitbird"
dude: "man, it's been a long time since i got any play, im calling what's-her-face"
other dude: "oooooooh, bootycalling the Shitbird!"
uncle: "you know we don't approve of your brother and his 'wife'. why did you bring them to my party?"
nephew: "it's not my fault, he saw me making the beer run, i had no idea i was going to be Shitbirding today!"
by ray bot March 26, 2008
by frank woods May 26, 2012
Originates from the ye old mainer up alone on his porch talkign about the passer byers. Commonly used with the term little infront of it.
by Justin B-K January 22, 2006
by RRP crew August 13, 2010
by Steve O December 5, 2003
by Giovanni29935 June 23, 2015
by Peterbilt1 March 1, 2014