I’m not sure when it started but it’s been a running joke for our group — making up new spells. One particularly bloody battle prompted the idea of a “spa” spell that would be akin to “heroes feast.” Spa treatment for up to six players with increased HP regen, etc. When my cleric reaches sixth tier spells, I’m going to plan it out.
There is a spell called “assay spell resistance.” Our sorceress cast it the other night. Michelle, the DM, was having trouble locating the monster in the MM. So one of the other players found the info really quickly on Google. We decided that for our group, “assay” would now be called “Google.” As in, “I’d like to cast Google spell resistance on that demon.”
When I was in high school, I had a group of friends that played D&D over lunch. The DM for their game had a lot of puzzles the players needed to solve to get through various encounters. At some point, they decided that they could use a spell they called “Ask a Friend”. The DM made them roll 1d4 to decide how many friends they could ask. I got asked to help solve a lot of puzzles. Remember, this is circa 1985. Every time someone quotes “Who Wants to be a Millionaire” and their “Call a Friend” option, I have a little geeky internal giggle.