(noun) When two people (usually women) give a man a blowjob
at the same time, whether it be at the head at the same time, licking the shaft or balls, or alternating between same.
"Dude! Last night, my girl had her friend come over and they both gave me a Double Header from Hades!"
"These two sluts I met at the bar took me back to their place for some Double Header action. Know what I mean?"