The more elegant way of saying ' Massive Ham'. People with this surname tend to have large penises or vaginal regions. It is also a used in naughty expressions post-sex to compliment the other sexual partner.
Person 1: So what did you do last night?
Person 2: ( whispers) i had a Massingham
*chuckles*
Person 1: Oh lucky you!
When you fail at something in life (eg. failing an exam or not getting a job), go home and spend an hour just standing in the shower, propping yourself up against the wall with your eyes on your feet.
Caleb knew the only thing to do after he didnt get prefect was take a failure shower.