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A British Fist is a new fast spreading term for a half boner or erection. A half boner is when the penis is almost erect, often at full erect length but is still movable or bendable.

The term (British Fist) is associated with a half boner due to both being SOFT YET FIRM.
Damn man i've been sporting a "british fist" almost all day and these sweat pants are not helping.

Dude that chick had such a nice ass, she gave me a "British Fist" thats the fourth time today thats happened.
by the biggest bub September 13, 2011
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