girls are not allowed to have any sort of interaction with a penis for the full month of december
boy: suck my weiner, wanna diddle around?, lets dry sex!
girl: i cant its decline dick december.
For people who failed NNN or people who want to challenge themselves further after winning NNN
Weak Mortal: “bro I just failed No Nut November”
God: “nah bro you can still do Decline Dick December”