An oft-used phrase used in the civilised locale of Liverpool. If you are unsure of the answer to a question, or lack a witty enough mind to come up with a decent retaliation, simply say, 'your ma'. It is derived from the art of performing sexual deviant acts with another person's mother. Variations include 'I did your ma last night, kidda' and 'your ma on toast'.
"You're gay, you are."
"You're ma's gay in bed, la."