A term used in coversation about sex. If a male lasts for 3 hours he is said to have done a "Big Ben". This originated in Kettering, England when a local home town legend lasted 3 hours in bed.
"I did a Big Ben" said George, Holly replied " Wow you lasted all that time!" . George said" I'm exhausted, I didn't know how i managed it, it had been over a year aswell!" Holly shouted " I'm proud of you George!"