I did some looking into and found out that the expression 'go bonkers' was more prevalent throughout the '90s in the US. I've read somewhere that it's use has started to wane at around 2004, and not very common nowadays. However, just a week or so ago, I've heard someone use the expression for the first time in--I must say-almost 20 years. Do people in the US still use this expression often? Or is it more common to hear people say 'go crazy' or 'go nuts'?
2004 was definitely the banner year for bonkers, but use has only dipped slightly since then. I can't say I hear it every day, but it isn't exactly beswevened.