Originated in Cardiff, this term describes the moment in a group conversation when someone attempts to be funny, but fails very miserably, resulting in a long pause followed by the announcement "Josh Moment" by another group member. Named after a particularly prone individual, though it should be noted that ANYONE can have a Josh Moment. The victim usually gets incredibly offended and often tries to avoid the inevitable announcment by continuing to crack "unfunny's", but only making themselves look more and more like a prat.
Jake: Haha! Yeh and then I said "WHAT'S A COW DOING IN THERE"?
Matt: Sounds a bit like what happened to you on Tuesday!
Josh: Yeh, it's like Old McDonald but ruder!
Jake: Josh Moment.