An uncommon and unsettling phrase used on Reddit, purportedly meaning to increase or add members to an existing group of friends. Most people think it's just a sex thing, regardless of what Redditors who use it say.
"I'm trying to increase the chubby so we can all go to Sam's for karaoke this weekend!"
The name homosexuals give to any and all raccoons, regardless of gender, color, location, or sub-species.
A group of raccoons are collectively known as "Susans".
Look at that sweet Susan - doing her Susan things with those other Susans. She's such a fluffy dumpster baby.