your mom is a term people use as a last resort come-back. it is extremely fatal and can cause death but funny on children so people use it as a first resort.
person 1: found out my little brother has brain cancer
person 2: your mom
person 1:*abrogates from earth*
something so big, It is the real reason Solar Eclipses happen, not the moon.
"Bro, This Eclipse was so cool today, I'm glad that Your Mom caused it"
a commen phrase used by gay men to show that they are gay
personA:what am i a donkey
personB:your mom