Someone who is easily agitated, throws a wobley then goes into a sulk.
These people generally are unable to communicate their feelings effectively/openly, but instead build up the thoughts inside their head then just explode.
The action of a cat arching its back and rubbing against the leg of a favoured person, often weaving figure 8 patterns in a way most likely to trip that person.
"As soon as I got home, both cats immediatelystroppedagainst me, quickly turning my pantlegs into furry lint-magnets."
Chiefly British slang, refers to a tantrum. Most likely refers to the leather items called 'strops' that would be covered in a buffing compound and used to polish sharp tools such as razors and chisels using a vigorous rubbing motion.
Adjective form is "stroppy", which can also be a noun form itself.