Yes, "nowt" is slang for "nothing".
by doing nowt you silly sausage!
nowt
DOUBT
Nowt.
Nowt
Nowt.
He is gay, nowt wrong with that!
nowt egg
nowt egg
In England it means "nothing" or none, as in "Hey, do you have some spare change?" answer "I am sorry, I have nowt to give you." Other English speakers may use "naught" (nothing, zero) in the same context.
nowt coz he ent got any
no it is nowt because 818 is much bigger than 49