Whereas a Smol Bean is something petite and cute (usually used in fandoms) a Smol Beans is an insult. It depends on usage.
to compliment one person: Hi Smol Bean to insult one person: Hi Smol Beans
to compliment multiple people: Hi you Smol Beans
to insult multiple people: Hi you bunch of Smol Beans
Smol Bean: Brendon Urie is a such a Smol Bean with a big forehead and I love him so much.
Smol Beans: (to my brother): "Shut up Smol Beans, no one cares."
Smol Beans: Say hello to all of my students, these beautiful Smol Beans.
Smol Beans: "Go away you insolent punk bunch of Smol Beans."
A phallus-shaped marital aid crafted from beans and/or bean-based products. A premium beanis comes with optional meatball attachment and ejaculatory arrangement.
The first mention of beanis was found in a fanfic by Majin Syeekoh and is sometimes referred to as a bean dildo.
"Have you heard of the new bean dildo?"
"Oh yeah! The beanis that jizzed sour cream?"
"No, no. This time it's hot sauce."