nntb 

short for 'no need to text back'. used at the end of a text message to indicate that you won't be offended by not receiving a reply.

"hey man, was good to meet you. you are hot, we need to have sex sometime. nntb x"

nntb by d ap g October 12, 2009

nntbb

no need to be bitchy

Used to tell someone they need to calm down.

"Nntbb Holly, it's not that big of a deal."

nntbb by Caeleel January 18, 2009