This is the act of being high on Cocaine. This is a well used term in the UK.
Person: Have you seen Mike?
Person 2: No, I saw him yesterday and he was on the pyramids for sure.
This is the act of motor boating a girl with larger than average breasts. The name originated from a large oil tanker ship by the name of Seawise giant.
Person: Did you bang her!
Other person: No bro, I got a Seawise giant though!
Person: Cool!