Gambling term refers to casino $100 black chips. Usually blackbird(s) refers to someone wanting a loan or to borrow money from you when your at the casino.
I was winning a lot of money playing blackjack and my friend kept pestering me to get a couple blackbirds to take over to the craps table.
by TheRealJayZ July 03, 2010
The act of leaving a group of people, especially a social event (i.e. business party), without saying good bye to anyone and without anyone detecting your escape.
Clare blackbirded the party by crawling out the window in the bathroom and walking home. Several hours later guests could be heard asking: "Where's Clare?"
by Pop Lambert August 05, 2005