Green’s Dictionary of Slang

cut the mustard v.

[the image of the condiment’s piquancy]

1. [late 19C+] (orig. US, also cut the asparagus) to come up to a given standard, to prove satisfactory.

2. [20C+] (W.I.) of a man, to satisfy a woman sexually.

3. [1950s] (US) to show off.

4. [1980s+] (US) to impress, to influence.