stuff

do your stuff perform a task at which you are particularly skilled or which is in your particular area of expertise.

2005The Star (South Africa) By now, he recommended that our entire house needed total rewiring, which he might as well do, he explained. I nudged my husband when he began to object. 'Let the expert do his stuff,' I hissed.

not give a stuff not care at all. British informal

the hard stuff: seehard.

the right stuff: seeright.

stuff happens: see shit happens atshit.

that's the stuff (or the stuff to give the troops) said in approval of what has just been done or said. British informal