This is what an individual or a group does to define themselves as a tink or tinks. If they are tinkering about ie. something which they think is cool- there are those (usually the minority) which think they are being...tinks!
Tinkering includes cliquey activities such as constructing a photo wall in the 6th year common room out of very tinkish photos (depicting certain poses, though done in the spirit of fun, usually behind each jokey pose there is an sicko who thinks they are being cool, and look rather darn good). Also School dances and other sick School related events (School trips, shows...) fall under the category of tinkering.
tinkering in the haystack, take it back to the bedroom.
To mess around with something and you don't really have a clue what your doing.
"Make sure Ed isn't tinkering with my car, I need that thing for work."
"Don't even tinker with my vacuum, I'll send it back to the shop."