The "Smith" of Ghanaian names.
Meaning, almost every Ghanaian has this last name. It is the equivalent to names like "Smith" for whites, "Chan" for Asians, and "Singh" for Indians.

If you know a Ghanaian, you know at least one Mensah.

The act of extreme masturbation. You must "knock one out" whilst in close proximity to any of the following; Your mum, a nun, your boss, a member of parliament, George Michael. A person with capabilities to act upon catching you mid self-abuse obvisouly ups the ante. Ejaculation must be reached before your danger wank target comes (no pun intended) to investigate. The higher the chances of being discovered with one's pants down, pulling one's war face is obviously where the danger comes from. The more danger involved the harder (or softer) it is to complete the task in hand (snigger). The more dangerous the better. The chance of being arrested, pummeled by an angry father or having your hand severed by an arab's sabre means that you are a pro "Danger wanker."

A person who is very smart and attractive.

Someone who is not only smart, but sexy

Oh and they have waves

Someone who somehow manages to get paid very highly, while still managing to suck absolute whale dick at their job.

Mensah comes from a Australian Youth slang. Mensah means You are shit or "Shit".

a very very small penis