So I google'd It's go time!

And boy did the Urban Dictionary enlighten me:

1.	it's go time	2 thumbs up
	1) phrase meaning, "I challenge you to a streetfight," usually accompanied by the challenger assuming a fighting stance 2) phrase accepting such a challenge to a streetfight "I'm sick of you insulting my mamma! It's go time, you punk ass bitch!"

Also on myspace is Scottytattoo...his quote is It's Go Time! Goscottygo!!

Click on scotty to check'em out!!

And finally It's Go Time! is an article about animals poop'in!!