It means going number 2 in the bathroom. In baseball, when a pitcher wants to throw a fastball, the catcher puts one finger down. If he wants to throw a curveball, he shakes his head to the fastball and the catcher puts 2 fingers down for a curveball. Also known as "calling for a curveball".
"I gotta shake it off
Cause the loving ain’t the same
And you keep on playing games Like you know I’m here to stay
I gotta shake it off
Just like the Calgon commercial
I really gotta get up outta here And go somewhere
I gotta shake it off
Gotta make that move
Find somebody who
Appreciates all the love I give
Boy I gotta shake you off
Gotta do what’s best for me
Baby and that means I gotta
Shake it off"
have so much money that one can give some to somebody on demand at once. The possessiveadjective may be one's, her, my, our or their as the case may be.