I think you mean 'mustard *****'.
In case the second word gets redacted, it is a common word for a small cat that starts with 'P', has 'uss 'in the middle and ends with 'y'.
OPP, how can I explain it
I'll take you frame by frame it
To have why'all jumpin' shall we singin' it
O is for Other, P is for People scratchin' temple
The last P...well...that's not that simple
It's sorta like another way to call a cat a kitten
It's five little letters that are missin' here
You get on occasion at the other party
As a game 'n it seems I gotta start to explainin'
Bust it