Acronym for "Too lazy to back space." Occurs when you misspell something on the interwebs, usually in a chat program or IM window, and don't feel like lifting your fingers to click the mouse to the error or to backspace all you've written to correct it.
A girl who attempts to get all the boys but fails and is also sexually inexperienced. Her qualities tend to include; nerdy abilities, bad hair and large nose.
Alex: God, Ruth is such a TTBS!
Steph: A what?
Alex: A TTBS!
Steph: Oh yeah, I know!
it can range from a couple of different meanings, space such as “throwback Thursday be your babe radio control” to “ throwback Thursday be your babe real chat“ to “you suck dick Andrew”