"Sit down and scratch" is a phrased used in Trinidadian Creole slang. Its represents an act of idleness, where a person has nothing to do and simply scratches themselves, is usually used sarcastically or as a joke.
"Wha dey feel it is? I busy inno, dey feel I does just sit down and scratch whole day awa?"
"Bai meen wanna do nun nah I just gonna sit down and scratch"