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Disparaging name for a Millennial, similar to their use of Boomer for baby boomers. Not all millennial are Lennies, a lennie is an angry, often confused millennial who calls anyone older than them a boomer, no matter the generation, and who is always looking for a reason to disrespect their grandparents
Lennie: (losing an argument)… ohhhkay boomer
GenX: go fight with your grandma, we genX don’t care about your Feelings or opinions

Lennie: boo…

GenX: sit down Lennie, nobody cares
Lennie by Thottron The great. January 16, 2022
a very autistic, has down syndrome and is a very goddamn retarded person in the world he is a gay son of a bitch because he put his arm around george and he is an cunt.
Peyton is like lennie big and autistic nigger.
Lennie by Xbellehumeur May 2, 2022
Lennies are naughty lads. They have a knack for getting in trouble, but they love their mothers dearly. Sometimes, they eat chicken, sometimes beef, sometimes salmon, and sometimes kibble. They are very respectful to their sibling. They are loud and project their voice very clearly. They have luscious curly hair and a nice round nose. Mostly blond with a great sense of humour.
Lad 1: Hey did you see lennies nose today?

Lad 2: Ugh what a nice nose.

Lennie/Lad 3: BARK
A peculiar or strange person that is usually alienated from society
Person 1- Ew, look at Lennie.
Person 2- What an alien.
Lennie by LennieFan April 9, 2023

Lennie Smalls 

1.) Mildly retarded character from John Steinbeck's novel "Of Mice and Men".

2.) A term used to describe someone who is unusually large and/or slow.
Person one: So Richard tells me you hired Lennie Smalls at the bar

Person two: Naw, don't talk that way he's a hard worker.
Lennie Smalls by Diggory17 March 1, 2009

lennie is stuck 

when a lennie is trying to lick you and he falls in between the sofa and farts
lennie is stuck
how
tried to lick me
oh typical lennie
lennie is stuck by unkowntoyou July 21, 2018