Mef (abbreviation) - Middle Eastern Festival.

MEF (acronym) - Managed Extensibility Framework in software development.

Mef (informal slang) - Expression of indifference or apathy.

MeF (medical abbreviation) - Myofascial pain syndrome related to muscles and fascia.

MEF (military acronym) - Marine Expeditionary Force, a U.S. military unit organization.

To make a loud noise or commotion.

To express annoyance or frustration verbally.

To cause confusion or disarray in a situation.

To engage in playful teasing or banter with someone.