1) Of or having to do with the Roman Emperor Caligula.
2) The mixing together of food and sex in a similar fashion to that of the Roman Emperor Caligula.
The Jack in the Box commercial that places the clown Jack in a hot tub with his girlfriend and his swinger friends is very caligulic in nature especially when the fast food restaurant's commercial insinuates group sex while advertising the tastiness of Jack's new Sirloin steak burger.
Refering to a body or part there in that is very well made and leads to anything overtly sexual in a obscene, dirty, filthy, make your momma cry kind of way.
created by Them Crooked Vultures in one of their songs; it implies a coitus closely realated to BDSM (it can be inferred from the lyrics of the song as well as from the roman emperor Caligula's tendency to sadistic orgies)