Grandma currency is what you get paid with when you do something for your grandma. It is usually 5-10 times the amount of money you would get if you were doing the same amount of work for anyone but your grandma.
It takes you an hour to cut your grandma's grass. You would probably get paid about 10 bucks an hour at a landscaping company for doing that, but because it's for your grandma, she pays you in Grandma Currency so she decides to give you 100 bucks for it.
You: Grandma, I'm done cutting your grass.
Grandma: Oh, thank you so much. Here's a little something for you for doing that for me.
(Hands you a fresh 100-dollar bill)
You: Grandma, I'm done cutting your grass.
Grandma: Oh, thank you so much. Here's a little something for you for doing that for me.
(Hands you a fresh 100-dollar bill)
by Mr Leahy January 9, 2010
Get the Grandma Currencymug. 
by Anonymous May 29, 2003
Get the Sloppy Grandmamug. by Raccooninabox June 16, 2006
Get the Slutty Grandmamug. by Sidenote October 9, 2006
Get the Grandma flabbomug. Your grandma and all her friends go sit in the steam room after they hog the pools. It's a grandma salad!
by Ailsa Gibbons November 5, 2006
Get the grandma saladmug. by anna45768 October 2, 2006
Get the ur grandmamug.