Gambling term refers to winning lots of money in a short period of time. Heater(s) means 4 or 5 digit wins or payouts gambling in a few days or a few weeks.
Last week I went on one of my insane heaters playing poker online. I started with $200 and worked it up to $3500 in 3 days playing No Limit Holdem.
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.