Noun: Short for "terrifically considerable" easily confused with the word terrible. However the use of this word can potentially get oneself out of a sticky situation.
The word terrable is derived from the TERR in terrifically and the ABLE in considerable, thus the word terrable.
Guy: you're absolutely fucking terrable.
Girl: I know *leaves*
Guy: *underbreath* oh shit I didnt mean to say terrible
Adjective - used to say that something is just as bad as or worse than what can be crapped out of your butt. Could also be a response to a bad joke or phrase.
Example 1 ~ P1: Did you just see that guy pick his nose? P2: Yeah, man that is just turdable. ~ Example 2 ~ "Once I had a dog without a nose." "Really? How did it smell?" "It smelled turdable."