Meg has gotten the idea "OK" is a synonym for "yes." Probably because when she asks for something I guess I usually say "OK." She uses it in all contexts, though, even if it doesn't make semse. Like if I ask "Is Paul crying?" she says "OK" Or "Is daddy at work?" "OK."
Sometimes it means basically the same thing as yes, but sounds funny. Like when she's begging for something:
"I want TEDDY GRAHAMS. Teddy Grahams, PLEASE. Please NOW."
"You want Teddy Grahams?"
"OK." (Said in a 'well, if you're going to try and talk me into it, I guess I'll take some' tone.)
It's adorable. Two-year-olds are so fun.