what / that thing (used in place of words you can't remember at the moment.)

anything; whatever one likes

above all / no matter how you say it / at any rate / after all is said and done

if you don't mind, if you like, if you're so inclined

nothing

something

any

use one thing for many purposes / work someone hard

to use one's head

(2channel slang) someone who immediately posts questions instead of doing basic research