Re: In the UK...
"My brother (state-side), states things like 'Ping me' in his emails."
That's when you go to google images and search for things such as "untreated" and "grinder accident". You then fill an email with those lovely things and send it off to him.
If your brother asks why you sent such things you say "you asked me to ping you, that's what means, right?"
If your brother explains to you what he considers "ping" to mean then you reply with "oh, I understand now". You then wait for him to ask you to ping him again and send him pictures of eye surgery and motorcycle accidents.