The surname Henderson is of Scottish origin and means "son of Henry". The name is derived from the Scots Gaelic clan MacEanruig of Glencoe which was later anglified to Henderson and McKendrick. Other areas of Scotland that the name made an early appearance were Caithness in the far north of Scotland in the 15th century, where Henry Gunn fell out with other members of the clan Gunn and adopted the name Henderson. Towards the end of the 16th century the name appears around Dumfries in the Scottish borders when the family are accused of being Border Reivers. The name was unknown in England prior to the 17th century and is first mentioned in a marriage document between one of the Borders Hendersons and the daughter of a Carlisle merchant at Hexham

also one of the best surnames ever!

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 Henderson is someone that possesses insane amounts of car knowledge and uses it to effectively to drop knowledge-bombs during civil conversations about cars.

The act of putting one's testicle into the anus of another. Usually done in multiple attempts.

A two-handed masturbation technique performed whilst viewing a poor quality video of a naked, jumproping woman. A popular variation involves the concurrent playing of the theme song for Rocky (the original).

noun.
1. the act of falling wildly in love with a female and professing this to her passionately, and losing interest within a week.

other forms: henderson-ed, henderson-ing, henderson-able

A henderson is a guy with dwarf-like features