I am a retired nurse. I can't look at a licence plate and not come up with something that 'stands for' something medical!
For example: BCP (birth control pills) SOB (no, not what you're thinking - shortness of breath) DVT (deep vein thrombosis)
As has been previously mentioned, we put these acronyms into a context that is familiar to us (IT, military, medical field etc). I don't get my panties in a bunch - it is kinda fun to guess what everybody means - and I too am at a stage where I don't care if I seem dumb cause I don't get it!