stuff

1 stuff /ˈstʌf/ noun
1 stuff
/ˈstʌf/
noun
Britannica Dictionary definition of STUFF
[noncount]
1 
informal
a  : materials, supplies, or equipment
b  : a group or pile of things that are not specifically described
2 
informal — used to refer to something when you do not need to name exactly what it is
— see also hot stuff, kid stuff
3 
informal — used to speak in a general way about something that is talked about, written about, etc.
4 
informal — used to describe the quality of a performance, experience, etc.
5 
informal : actions or behavior of a particular kind
6 
: personality or character
7 
: the material that something is made of — often used figuratively
8 
baseball : the ability to throw pitches that are hard to hit

and stuff

informal
— used in speech to refer to things that are similar to the thing just mentioned

do your stuff

informal
: to do the things that you are able to do well : to do things that you are known for doing

know your stuff

informal
: to be an expert at something

show your stuff

informal
: to show what you are able to do : to show your skills

strut your stuff

— see 1strut
2 stuff /ˈstʌf/ verb
stuffs; stuffed; stuffing
2 stuff
/ˈstʌf/
verb
stuffs; stuffed; stuffing
Britannica Dictionary definition of STUFF
[+ object]
1 
: to fill (something) so that there is no room for anything else
— often used figuratively
2 
: to push (something) quickly and carelessly into a small space — usually + into
3 
: to put a seasoned mixture of food into (something that is being cooked)
4 
: to fill the skin of (a dead animal) so that it looks the way it did when it was alive — often used as (be) stuffed

stuff it

informal
— used as an angry and rude way to say that you do not want something or are not interested in something

stuff the ballot box

— see ballot box

stuff yourself

informal + often disapproving or stuff your face
: to eat a large amount of food