tuna mayonnaise; tuna mayo
A mixture of canned tuna and mayonnaise, commonly used as a sandwich filling, pasta sauce, or onigiri ingredient. Often abbreviated to ツナマヨ in casual contexts.
I made a tuna mayonnaise sandwich for breakfast.
This rice ball has tuna mayo inside.
Variant with interpunct; less common in everyday writing.
Wasei-eigo compound from English 'tuna' and 'mayonnaise'.