1 definition by Accidental Linguist

Noise made when ending a telephone conversation that is neither too abrupt nor too drawn out. If the person on the other end has a final thought the "mmm" part is a soft tone designed to let that person express the thought before the hard and final "bye"

As opposed to "kbye" which is too abrupt, or "Okay, talk to you later, goodbye, (OMG it's taking forever to hang up), click"
Customer "Okay I think that cleared up the problem."

Tech Support "Anything else I can help you with?"

Customer "I don't think so, thanks."

Tech "You're welcome, mmmbye."
by Accidental Linguist September 22, 2011
Get the mmmbye mug.