Where a girlfriend/boyfriend plays with their boyfriend/girlfriends tongue with their own.
Basically making out without any lip action.
Boy: Ms. Marie?
Ms. M: Yes?
Boy: Would you like to play some tongue hockey?
Ms. M: I'd love to
Deep or French kissing in which the partners have a lot of tongue contact, figuratively resembling hockey players battling for the puck with their sticks.
I was playing tongue hockey with my honey on the couch.