A gay or bi boy, who is always hungry for, needs or is getting dick. Symptoms include an emptiness in your ass where a cock would be.

Briefly, "the realization that each random passerby is living a life as vivid and complex as your own." Originally from the Dictionary of Obscure Sorrows, which has a lot more beautiful neologism definitions like this you might enjoy.

Defining one's sexual preference or sexual appetite

To hunger for ass. Used to describe a male homosexual's cravings for consensual anal spelunking.