At the point of a conversation where one person is so into it that they start spitting and the words start becoming gibberish
OMG. Dude we were discussing puppy cuteness factor. You're word cumming all over me.
To express a semi over dramatically apathetic expression of gratitude
Person 1: I'm waking up at 3:75pm tomorrow morning so that I can take the car for a walk. Would you like me to pick you up a nice hot iced coffee on my way home?
Person 2: Word' cum