frostgun
To shotgun a Wendy's Frosty. The preferred method for doing this is to take off the lid, bit a hole in the bottom of the cup, and suck out the Frosty.
Wendy's employee: "Would you like a lid for your Frosty?"
Wendy's customer: "Nah, I'm just going to frostgun it in the parking lot.
Wendy's customer: "Nah, I'm just going to frostgun it in the parking lot.