When I Greg come across any and all relation to your Mother and correlate it to something either insulting, or of sexual nature.
You: I walked to town today. Greg: I walked into your Mum today.
Hello there handsome girl
OMG ITS YOUR MUM! SHE IS SO SEXXXXYYYYYYYXYXYXYX
I like big stinky penis and i love to gargle on smegma
guy 1: "hey do you know what time it is?"
guy 2: "ya your mum"
guy 1: ":/"
Your mum is the person who gave birth to you after having sexual intercourse with your dad
Guy1: Who was you with last night?
Guy2: Your Mum