Nichan sleeping bag
When you stick both feet into a vagina and pull up until the vagina fully surrounds you in the shape of a sleeping bag
Bro #1: “I got so cold last night I went to my girlfriends house and used her as a nichan sleeping bag”
Bro #2: “same bro but I used my dog instead”
Bro #2: “same bro but I used my dog instead”