A guy asked me if my amp had a transistor, I just answered yes, don't know why:P

But what is it?
no no no, a transistor is slang for a transvestite sister.

in all seriousness, though, its the component that is used instead of tubes in a solid state amp.
I like analogue Solid State amps that make no effort to be "tube-like", and I'm proud of it...

...A little too proud, to be honest.