the literal meaning of the word is a "box for holding tinder", tinder being something combustible you use to start a fire. A tinderbox can also be a potentially dangerous situation or location.

The proper usage of the term is as an insult that sarcastically implies that somebody is 'fake tough'.
"Dang B! The Angeles National Forest is a tinderbox during the hot, arid summer."

"Hey tinderbox, wanna do something about it?"
by The amazing hobo September 15, 2004
A redhead's vagina.
The paparazzi got a great upskirt shot of Lindsay Lohan's tinderbox.
by lmno123 April 10, 2009
The term used for a girl one finds on the dating app "Tinder" when your sole intention is to fuck the shit out of her box.
Roommate - "Have you found anyone new on Tinder?"

Me - "Yeah, I found a new tinderbox last night. I bet she can't wait until my dick is inside her."
by The AFM February 19, 2014
The soft bit of skin between your balls and your arsehole.
"Oh my jeans are grinding against my Tinderbox"
by Jonny83 June 27, 2007

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