1. Often used to describe a double sided or two headed sexual device known commonly as a dildo.
"Man that's one long double dong" or "Constance would you like to share my double dong, that would be lovely Prudence"
(noun) This is a sex toy used by lesbians in pairs to enjoy a cock without having to deal with men.
What makes this sex toy popular is the fact that both women bask in the orgasm of each other. The more one tries, the better it feels for her and her partner. It's kinda mutual.
Other versions of this toy include squirters at each of the heads and vibrators.
Lesbian 1: I miss cock.
Lesbian 2: I'm horny and I too miss cock and I hate men.
Lesbian 1 & 2 (together): LET'S USE A DOUBLE DONG!
(15 minutes later): *sighs of relief and orgasm*
The act of playing two MMO role-playing game files simultaniously.
My son Bruno will not stop double donging!
A two sided dildo. Great for penetrating two people at once.
Babymomma: Who is going to strap it on tonight?
Candice: I want to get it tonight, you strap it on!
Babymomma: I strapped it on last night. YOU strap it on!
Candice: Well, we could use the double dong and both get some action...