Trimley, in short, is a derogatory term to describe someone for the purpose to offend, normally to do with their trim but is dependent on the situation. It derives from the famous Hadley Matthews. Other synonyms used to take the piss include: ratley, shitley, ladley (if they’re being a lad)
Person 1: (falls off chair)
Person 2: ‘hahahah Tim you’re such a trimley’