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1.
An english term used to describe someone who is generally a pain in the buttock and gets on your tits.

there is also a shop called nincumsoop in westfield shopping centre and it sucks ass so don't go there secksay.
Aisha: OMFG. your like the biggest nincumpoop in the history of mankind. GET YOUR SEXY ASS OVER HERE AND GIZZUS A HUMP.
Alexa: Sure babs.

Aisha: wooooo sexy temps
by Alexa and Aisha August 01, 2009
 
2.
A foolish fellow; also one who never saw his wife’s ****.
Take a good look at Yoko and tell me John isn't a nincumpoop.
by Neo-Nincumpoop April 03, 2007