I always found PMT an unfortunate name. Clearly given that abbrieviation by men who may not have realised the abbreviation is much more common for Pre-Menstrual Tension.
I will admit to having come across PMT (the bus company) before I knew what the other meaning was. But I was only 12 when I first saw their buses. (Well actually I would have probably seen them even earlier than that, but I was 12 when I actually noticed them...)
Hutchings & Cornelius in Somerset was quite a mouthful, so the buses just read H&C, which inevitably became Hot & Cold.
Subsequently Badgerline in the adjacent area was just a stupid name.
I thought Badgerline was quite a good name as it suggests 'rural' and quite well represents the predominantly rural area of Somerset, Avon and Wiltshire that they served.
But my opinion of them did decline a little when I actually started using them regularly... And I remember "Bodgerline" was one common nickname for them.
They weren't that bad IMO (this was in the privatised days in the mid nineties) but the fares were a little high. I found their operations, diagramming, and variety of vehicles interesting which helped my opinion of them.
Also...
Not buses, but trains, but when I was using Wales and West regularly in the late 90s, I nicknamed them "Snails and Pest". Don't think it was a widely used moniker though.
Overcrowded 2-car 158s (few 3- or 4-car in those days, and the one train booked a 4-car - and it needed it, the "17.35 Wales and West Alphaline service to Portsmouth Harbour" as announced at Bath - was frequently only 2) and frequently late services (the same 17.35 being a notorious one for delay, I remember it not-infrequently arrived behind the following 17.51 to Weymouth and then crawled along behind it making it even later) was the cause...