A mammal with a pouch to carry its newborn in their infancy. But more importantly, NOT A PANDA.

When something is so cute you just want to pick it up and stick it in your pouch/purse/backpack/pocket

Koalas and shit

Animal from Mars that is often supine

When a male grabs the lower portion of his scrotum with both hands, pulling it out and upward towards himself, leaving his cock sticking out like a "marsupial in the pouch". Ususally for the entertaiment of others.

When a chick has a pouch, much like that of a kangaroo that sticks out and makes her less formal.

Marsupials are small mammals that are attached to the male body and as in the animal kingdom spend most of their life in a pouch. Only jumping out to surprise people!