A person with an abnormally large and square head. Has a tendancy to fall over as his/her body cannot handle the sheer weight of 'the head'. Often seen obstructing the entire view of televisions.
A: "Oh my days look how abnormally large and square that dude's head is..."
B: "Total mcbroom."
When your ball sack skin gets all loose and stretched out because you have been in the bath for a long time.
Dude I was in the hottub for like an hour but when we got out she saw my McBroom and freaked out.