There are 2 main definitions of mayo in English:

mayo1

Line breaks: mayo
Pronunciation: /ˈmeɪəʊ
 
/

noun

informal
Short for mayonnaise. she can have lean turkey with mustard and skip the mayo
More example sentences
  • The mayo calls for 2 egg yolks, salt, dry mustard, vinegar, and one cup of olive oil.
  • I had a hummus and chicken wrap with roasted peppers that would have been delicious but for the watery mayo it was drenched in.
  • Inscribe this on my tombstone: He liked his mayo, but gave his life for his schmaltz.

Definition of mayo in: