When kissing your partner you alternate sticking your tongues out into each other's mouths similar to a frog sticking it's tongue out!
Dude! I just had the hottest make out session ever! She totally started frog tonguing me!
The action of locking eyes with someone and shooting your tongue out of your mouth, sometimes achieving contact with said person's face.
Cornholio and I were caught in a wicked frog tongueing match that ended with my tongue in his mouth.
Frog tongueing seemed to be the theme for my awkward flirtations with my spicy boy toy.