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The act of having huge muscles and showing them off in public. Typically by flexing and doing bodybuilding poses.
Bro did you see Arnold on the beach? He was straight up moggin on everybody.
Moggin by Swoledaddy94 February 20, 2022

Barney-mugging

Barney-mugging, is a slang word from the 1920's meaning SEX
Yup, I was barney-mugging Ashley all night long baby! Whoooo!!!
Barney-mugging by AlreadyDead June 20, 2007

mugging up 

When 2 people are kissing in a corner, typically a shady club or house party.
Did you see Jenn mugging up with Rob last night?
mugging up by Cresse September 11, 2005

Mugging Down

To make out in rough manner often times leading to sexy time.
Dan was caught mugging down with Mike's mom.
Mugging Down by Dan Glenn February 20, 2008
Aussie slang: To eat something
'What are you doing?', 'Just mungin' on some bread'
Mungin' by Aussie Slang Pro September 17, 2012
To bother or annoy someone or something
"Man these exams have been magging on me all day!"