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1.
Head/earphones that no longer work
Guy 1: Dude can I borrow some headphones? I wonna listen to some sweet beats.

Guy 2: No, sorry dude.

Guy 1: Why, I thought you just got Dre Beats last week.

Guy 2: Yeah but they no longer work, they're Deadphones.

Guy 1: Man that sucks.
by sieffy13 June 22, 2012
 
2.
Headphones that have quit recessing sound either immediately or over time a.k.a they don't work!
"My headphones are deadphones"
by E_to_da_F April 14, 2010