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mumblefuck 

1. Trying to talk while engaging in oral sex.
Giver: Mfff mfff, whff dff ffffk?
Reciever: Quit yo mumblefuck, bitch.
mumblefuck by Kurt Jones May 1, 2005

mumblefuck 

An extremely socially-awkward person, that rarely involves themselves in the coversation and only contributes to the conversation by randomly commenting with a semi-muffled mumble (this usually is followed by a very, very awkward silence within the whole group of people).
That kid Nile came over for the first time last night and was being a mumblefuck the whole time.
mumblefuck by corndonnus March 11, 2010

mumblefuck 

Mumblefuck spent over 7 minutes sitting on his ass on 9/11/01 after being informed of an attack on America.
mumblefuck by Mudesi September 13, 2006

Mumblefuck 

When the person you're talking to is mumbling and you can't understand a damn thing they're saying. Usually used in situations where they're giving you important information like a reservation number or directions on how to get somewhere.
A typical mumblefuck conversation.
"Can I get your order please?"
"Yeah-um...I'd *mumble*...and then *mumble* large *unknown stammering*"
"I'm sorry, what?"

"Hey, Amy, how do we get to your house from downtown?"
"You'll go down *mumble mumble mumble*...after that you'll take a *mumble* onto 4th *mumble*
"Hold on, Amy, just a sec....Guys, can you shut up for a sec, this is a real mumblefuck conversation and all your talking isn't making this any easier to hear."

Mumblefuck 

The sound a girl makes during sex, but needs to be quiet.
Her parents were light sleepers, so she had to mumblefuck all night long.
Mumblefuck by VistalgiaRevan September 1, 2020

Mumblefuck 

Mumblefuck...
1.Can't understand a single word that's said
Mumblefuck said what?
Mumblefuck by Missty May April 22, 2022