a. positive - when the one girl is the cool girl among the group of guys.

OR

b. negative - when the one girl is the annoying girl like during a sports game.

** always - a girlfriend you would never fuck
shut up and watch the game, stop being such a sister dick
by purplepalace May 29, 2011
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A combination of women who have had sex with the same man.
I wonder if Linda and Amy know that they're dick sisters since Joe banged both of them.
by The Sex Panther April 5, 2008
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A female who has dated/fucked the same guy you have
Shannon and Sharon both dated Dustin, therefore they are dick sisters.
by Paayton December 4, 2018
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When a group of girls knowingly fuck the same guy.
I’m going to meet up with my guy tonight, and my dick sister gets him tomorrow.
by SBRider19 August 29, 2018
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