Any action taken by a person looking to have a relationship with another person, that effectively ruins their own chances of having said relationship
Guy 1: "So I was really into this girl, but when I walked up and kissed her on the cheek, she freaked out."
Guy 2: "Way to go man! Talk about Sinking Your Own Battleship!"
lochie is the twat who thinks they own everything.
Not sit down and watch the work progress instead of contributing yourself to the work and being an equal member of the group.
When you work on a group project it is is important to pull your own weight
One finds a lit candle burns their fingernail clippings then sells them in their front yard. this was outlawed in 1989 so dont do it! also theres a version where you burn your crap.
Jungkook: ima make my own candle shop!
Jin: as the hyung i will not allow you to get into any illegal shananagans like make your own candle shop