Abbreviates from "Say nothing" and in slang terms "say nuttin" or "snm" or "say nay". It is an Inner Pinner London slang that is used by many a folk that are notoriously in all cases the dons of London. For an exceptional case, "say nelly" can also be catastrophic. These are the following meanings of the word:
1. Say nothing
2. A question to ask when you are comletely baffled by something
3.When its a donatella hype ya dun
4. On a moist yout ting
5, murkalage

6. Armageddon (end of the world)
7. When you want to beat someone

8. something you say before recieving a man down
EG.
1. Nik: oi your sick! i think i love you?

Charlie: SAY NELLY

2. Terry: Whats the day today?

Richard: Nelly?

3. Adeyemo: Watagwarn families

Sherif: CUT (nelly)

4. Rob: Mans got a wedding tomorrow still

Neil: moist

(differentiated on a nelly basis)

5. urgu patel: Oi what the FUCK is that? (pointing at a nuclear bomb)

Benjamin nevillainya: MURKLE..........nelly?

6. Head of the army: Im calling an air strike pronto, i want four men at my rear to cover me.

*BOOOOOOOOOOOOOM* end of the world

Michael: Sorry that was an accident (hand in the air clearly showing that he is apologizing that he blew up the world therefore it is fine). i will now be a nelly.

7. Rox: SHE'D GET BEAT IF SHE COULD DO THE SPLITS, SHE IS PAAHOOOOOOOTENT.

Luke: Yep. thats right. Potent yep. Thats correct. yes. nelly.

8. Kentish: nelly?

Anthony: Go out and get the door will ya....... (fire extinguisher to the ready........MURKOFF).
by donatella1994 May 5, 2011
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