As a Noun: 1. The act of sexual intercourse between two people. Informal Australian English = screw, root. As a Verb or Adjective: 1. To have sex with someone. informal English = bonk. 2. To have sexual intercourse with someone. Informal Australian English = screw, root. Note: 1. Some signers consider this a crude sign. Compare with other signs found under the keyword ‘intercourse’.