Colter Wins Gramma's Heart...and Stabs It A Little

He's already doing pretty well with the ladies his age, now he's learning to woo others with words. Last week at Gramma's:
"How old are you Gramma?"
"65."
"You don't look 65."
On the other hand, he seems to have inherited my smart-ass streak as well. Gramma tried to be funny and tell a joke. Here's his reply:
"I have a joke for you, Colter. What do you call giving a bison money?"
"What?"
"A buffa-loan!"
"Is that the joke?"