To call yourself so that you can find your cell phone.
"Dude, dial my number, I need a self-phone cause I was drunk last night when I put my cell phone down."
by afichte May 22, 2008
A phone I use to call myself. Play on word sound cell phone. (See cellph phone.)
That's my self phone. I use it to call myself.
by Phil Kelley February 16, 2005
1) When your phone's autocorrect absolutely savages you.

2) When you are texting in bed and accidently drop your cellphone on your face.
"Yo, I want some dick

Some duck* ... Shit"

"Lmao, cell phone self own"
by F41R September 3, 2021