custard no mustard is a term to describe something like a place or thing or event that is good, fun, exciting or went exactly as planned. It's a unique and kinda cringy way to express
positive feelings.
The opposite of
mustard no custard.
(The ironic part is I
fucking love mustard, but in this context, custard is the "sweet" part.)
"Yo, this party is pure custard no
mustard man!
The music is fire, the vibes are perfect, and
everything is going exactly as planned. LETS FUCKIN GO!"