The extreme of going apeshit. To completely lose one's mind in a violent manner, or when used to describe a situation, the act of descending into complete chaos.
When I found out that my entire project had been deleted, I went completely apeshit bananas on everyone that had touched my computer in 24 hours.
City of London (UK) slang for a lunch accompanied by 4 pints of beer. Named after Sir Roger Bannister who was the firstrecorded person to run a mile under 4 minutes.