someone who you do not want to anger... eg. a heavy hitter
don't screw with him, he's a mulhall.
by Bob Sacamano March 4, 2005
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This word comes from North Yorkshire and the Lakes, often used amongst Cyclists to describe them being in a pissed state during their many post-riding events held in large venues such as concert halls and high-class hotels, mainly around Christmas and New Year. Similar to Mullhalled but spelt the proper way, many Cyclists are known to use the phrase regularly when drunk at festive gatherings.
"I won't be doing much riding this weekend, I'm aiming to get truly Mulhalled".

"Did you see Martin last night at the Christmas gathering?"
"I did, he was completely Mulhalled wasn't he! I saw the pictures".
by BaldandProud84 June 3, 2019
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An "outsider". Someone your group of friends knows but doesn't like to include in anything because he/she isn't liked
Don't invite Johnny to the bar, he's such a Mulhall
by Ryan Mu November 6, 2008
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