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1. ndd
An alternative abbreviation for "indeed". Mainly used by gamers.
- They should be here by now, dont you think?

- Ndd
2. NDD
Next Day Depression. Typically used to define the feeling that one has the morning after a long night of drinking and perhaps some ill timed decisions. For males, that means fucking that fat chick. For chicks, that means being a slut and kissing 5 of your boyfriend's friends. Usually accompanied by a overwhelming sense of apathy and refusal to step out of your room for fear of someone seeing you who knows what you did the previous night.
"Where's Jim at?"
"Oh he stayed in...bad case of NDD."

"Dear teacher: I did not get your paper done on time becuase instead of doing it on Sunday like I should have, I sat under the covers of my bed dealing with a serious case of NDD."
3. NDD
No Dick Diet.

The act of withdrawing from sexual activities for some time being.
Girl 1: Fuck guys, theyre assholes. I'm gonna be celibate now.
Girl 2: Youre goin on the no dick diet?
Girl 1: Yeah :( it's the NDD for me
4. NDD
abbrev. Non Daughter Daughter. The daughter of your NGG (Non Girlfriend Girlfriend), who you treat like she was your own daughter.
I met up with my NGG but she had her NDD with her so we couldn't fool around.
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