In Halo series games, a headshot with a 'Human' sniper rifle, or S2 AM sniper rifle. The rifles caliber is 14.5mm. Thus, a 14.5mm brain surgeon, is a good sniper.
Sniper to opposing player: "Well i dont know if i can fix your level of stupid, but I would like to see the effects of some 14.5 mm brain surgery!" (THis statement is either following, or is followed by, several sniper rifle shots.
by strangr236 May 2, 2008
Get the 14.5 mm brain surgerymug. 
14.5-tuple-4C: Person who, in relation to the other person, has zero parents, zero grandparents, zero great-grandparents, zero great-great-grandparents and twenty-nine great-great-great-grandparents in common.
My 14.5-tuple-fourth-cousin is a good person.
by ABGR June 9, 2021
Get the 14.5-tuple-fourth-cousinmug.