It's a derivative of the "Your mom" insult. The function varies slightly from the original insult as it specifies the condition the so-called "mom" is in.
Rob: Your mom Is fat.
8yo kid: *cross*
12๐ 4๐
your mom on a stick means your mom + my stick = a big mountain of joy....
me: you're a dick
you: your mom
me: your mom on a stick! haha! PWNED!!!
26๐ 12๐
an insult infinitely superior to "your mom"
Person: Your mom!
You: Your mom's car!
Person: Oooooo! That hurts! You win this round...
26๐ 14๐
a word that answers any question
sam: what did you eat for lunch today
me: your mom
1๐ 4๐
a term used by 7 year olds to try and insult you
Mark: Your mom is a hoe bitch!
Landon: No u
Mark: *fucking dies*
11๐ 4๐
An insult of such incredible, nonsensical idiocy that it's normally used as a barb for the beginning of a larger, meaner insult. It normally leads to Your mom's face, then Your mom, and so on and so forth.
"Hey, your mom's pie, wooooo!"
15๐ 8๐