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The act of kicking someone in the balls with a great amount of strength, often resulting in death.
"Wow, he just totally hit Dennis with a Gwilliam!"
Gwilliam by Grand Master Young February 10, 2009

Terry Gilliam 

One of the greatest, most twisted directors of all time, who has to date made criminally few films and is plagued by terrible luck. Best known for his Monty Python animations, "Brazil", and "Fear and Loathing in Las Vegas", but actually the rest of his films are equally brilliant.
I never thought that Terry Gilliam could get even more unlucky after what happened in "Lost in La Mancha", but I'm reconsidering after Heath Ledger's death.
Terry Gilliam by prettymaryk March 22, 2008
First recorded around the time of the norman conquest of 1066.
Mainly used back then in honor of William the conqurer as it also originates from the name (french origin) William.
Gilliam is the correct spelling of the american surname where as there are many other spellings which were obtained by derilict gypsy prostitutes in england and old time ghetto dwellers of barbados in the 1600's.

Gilliam:(pronounced Gil-am) is best defined as the greatest man ever created. The inventor of the french dip,the haitian fruit basket, and the mongolian teepee. All Gilliams are underworld leaders and have more power than your local government. Very intelligent, and very attractive...Gilliam men exceed expectations in all catagories. Gilliam women inherit the same traits.

Famous Gilliams include:Terry Gilliam,Joe Gilliam,William E. Gilliam,and Scott M.Gilliam
what do you call a Gilliam that cant hold his liquor?
Adopted.
Gilliam by HarmonyKoruption February 3, 2010

Alex Gilliam 

Possessor of an extremely large reproductive organ. Astronomically superior intellect in comparison to his peers. six foot two, handsome, and confident. Also, anything is possible when you lie.
Alex Gilliam by BgAg25 February 17, 2017

Guilliam 

A blowjob while watching a basketball game (bonus points if its the Indiana pacers) and smoking a blunt.
Dude I just got the best Guilliam today
Guilliam by De-vooonnnnn April 5, 2011

Gwilliams 

(NOUN) The art of being a tactless; womanising, geekish, sped.
Did you see that totally hot guy, jenny?
No way...he was a total Gwilliams
Gwilliams by Rebecca April 10, 2008