Verb. The action of ejaculating into one's rectum then proceeding to pack the entirety of their shirt into their semen-filled anus and allowing it to dry, effectively becoming a solid seal.
1. After a night of aggressive anal sex with Larry, Steve decided it would be a funny idea to suitcase him.
2. After 35 minutes of aggressive suitcasing by his partner, Charles discovered that no matter what he did, he could not remove the shirt from his rectum.