Nobody got it right yet it looks like. I used to work at McDonald's and "Table" meant making the sandwiches. We usually had two people on table, or just one if it was slow. So on table would mean getting the right wrapper out and putting the condiments on the bun and/or putting the meat on and wrapping it, depending on if you are alone or with someone. I think wrapping them is the easier part on table because you don't have to pay attention to when a new order is coming in, the other person does.
"In grill" meant either on table, cooking the hamburger/grilled chicken, or putting the fried meats in the oil vats, three different jobs in grill. So hopefully it's the meats you are saying you don't know :)
And don't feel bad about Bloodmoney's comment. 1 in every 8 Americans have worked at McDonald's at some point. That's just McDonald's specifically. (I read an article called "18 Facts About McDonald's That Will Blow Your Mind" recently lol). It's a very common starting place, it is not a job reserved for idiots.
Time spent working in the hell we call "McDonald's."