Most of these people are giving you terrible advice. Unless you're 13, don't just come right out and compliment her. Jesus Christ, who's giving you advice, Chester the Molester? You need to use an Inverted Compliment Sandwich. And you have to be fucking smooth to pull it off, so don't just bust it out all over the place. Basically, you have to open the statement with something playfully insulting (read careful: PLAYFULLY! If you offend her, you're fucked, so fly casual) before you concede a compliment, hopefully on a related track as your playful insult, than close with another playful insult. If she's smiling and laughing during your teases, you know it worked. If she's looking shocked, you just fucked up son, get the check and bounce with a quickness.
Oh, and one more thing: if this is your first time at bat, don't swing for the fences. Play inside your league. DraconianKing had it spot-on. Fat girls are awesome, they try harder. Practice being smooth in the outfield before you take it to the diamond.
These baseball innuendos doing the trick?
