Top definition
During World War II British spies would sometimes use semen to write secret messages on paper, as it was invisible except with a black light, which were not common back then. The term now applies to cumming on a girl and writing a secret message with it on her using your dick.
Man, I can't wait to take this girl home and give her a British secret message.
by goldencalculatortodivide February 06, 2013
Mug icon

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug