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In Texas Hold'Em, it is commonly referred to when holding a King and an Ace. It is called such because it is a sweet, sweet hand, but can cause a bit of a toothache.
"Whoa Burt, I just ran my Big Sugar into pocket Aces! I was sure I had the best hand!"

"That Donk had a 25 against my Big Sugar!"
by HMFD November 08, 2007
Typically refers to wealth. In particular, in the form of liquid assets.
I'll be getting big sugar from my tax return this year.
by Quajupeg March 16, 2006