As a Noun: 1. A sexual act between two people, especially sex which involves penetration with a penis. A crude and silly sign which most signers find offensive and associate with sniggering adolescents. English = fuck. As a Verb or Adjective: 1. To have sex with someone, especially sex which involves penetration with a penis. A crude and silly sign which most signers find offensive and associate with sniggering adolescents. English = fuck. Note: 1. This is considered by most Auslan signers to be a vulgar sign. If you do not want to appear ignorant or childish use one of the neutral signs listed in this dictionary for this sexual act. They can be found by searching for the keyword ‘intercourse’.