A smaller, skinny penis that is less filling that your average cock.
I let him rail me from behind last night but he had a diet dick so it was rather disappointing.
by Dick Onchin October 27, 2020
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When you tell people it's your choice to take a break from the penis but you're really just a lonely fuck and no one will have you.
Louise: I'm on a dick diet
Ciara: No you're just a mess and no one will have you
by SuzieBee October 2, 2017
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When you start going out with a skinnier/fitter dude and feel the pressure to go on a diet so you can continue getting that dick.
- Man, have you seen how much weight she's lost?

- Yeah, its cause she started going out with Dylan.

- The crossfit Dylan??
- Yeah, she had to go on a dick diet to keep hooking up with him.
by BananaMama123 May 17, 2022
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When you have a new bae and feel the need to lay off the junk food in an attempt to feel more confident during sex.
Damn Steph, I'm gonna have to go on a dick diet now that Chris is coming over every night.
by Stephaniyah Spieyeinayah December 13, 2016
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