A girl that is a bitch only some of the time, and the rest of the time is a perfectly nice girl. Much like the flashing christmas tree lights that are off sometimes and then blink on, but then are off again.
A woman who goes from being awesome and friendly to a complete bitch faster than you can blink. In these women, it will seem almost as if a light switch is flipped inside of them and BAM! they will morph into bitchy bitches.
Girl coach: How was your night?!
Athlete: Great thanks for asking!
Girl coach: WHY AREN'T YOU DOING ANYTHING?! GET TO WORK DAMMIT! YOU'RE SQUATS ARE TERRIBLE!
Athlete (to fellow athlete): Coach is such a light-switch bitch.
When you’ve been talking to a girl for so long and you get to know her so much and then all of a sudden she switches up on you turns into a different person and makes you hate her. .....the light switch Bitch.... here one second; gone the next.
The Light Switch Bitch is the girl that you have been talking to you makes you feel like you know her, then out of nowhere she switches up on you .
Friend: don’t worry about her, Tanisha just a light switch bitch...it’z what she do
You: I know but she made me feel like I was the only one. I gave her all my energy and time. Then her personality DIPPED!
TLSB is basically a female that makes you think and feel as if they care about you, and as you get to know them they switch up on you for no reason, and leave without explanation. ...how rude...what a Light switch Bitch (TLSB for short)