Used to express the extremities of some situations. Originaly quoted from tourrettes guy in reference to his fish sticks being hard.
Oh man, im hungry as tits!
I stayed up all night playing xbox, im tired as tits now.
A suffix used to add emphasis to something, it can related to absolutely any situation.
Zach: "you did you see that bitch?"
Keegan: "yeah man she was hot as tits"
Jesse: "that bitch i ate out last night was fishy as tits"