Define Caught Fire Meaning

Big D. caught fire as soon as his lady entered the room.
Man as soon as I found out what the job consisted of, I caught fire.

Seemed to stop my breath
My head on your chest
Waiting to cave in
-------------------
In your eyes like my first time
That I caught fire, just stay with me
Lay with me
-------------------
Lyrics come from the song I Caught Fire by The Used

And I'm melting
In your eyes
Like my first time
That I caught fire

He looks like his face caught fire and someone put it out with a shovel! I fell off my bike. Twice.