watermelon seller 

a person who is aware of something, but chooses to either ignore it or lie about it; a lair or a fraud

comes from the saying that a watermelon seller does not know if the watermelon is ripe or not but promotes them regardless. it gained notoriety when it was attributed to the president of Turkey, Recep Tayyip Erdoğan who is described to be a crook and fraud.

Now lets talk about that 'watermelon seller' Erdogan, he sold me a basket of Apples knowing they'd be rotten on the inside.

watermelon seller by beluga_fish October 9, 2020

best seller

best seller, a bitch IS NOT THE BESTSELLER OF ALL TIME DONT LISTEN TO WHAT IT SAYS BIRDS ARENT GODDAMN REAL SHUT THE FUCK UP DUMBASS I BEAT JOHN CENA IN AN ARM WRESTLING MATCH AND MADE HIM CRY BITCH, I CAN BENCH AS MUCH AS MY DAD

THE WORD BEST SELLER IS FUCKING STUPID WHY IS IT ON EVERYTHING GOD IM PISSED OFF AND KINDA HORNY

best seller by finsterwald March 29, 2023

sellotrap 

The game of Sellotrap (tm) is where stationery and boredom collide.
When a co-worker leaves their desk unattended, it is your job to set up a sticky spider's web of sellotape to ensnare your colleague upon their return. Ideally the web should be almost invisible to the naked eye, although a common way to make the sellotrap work is via distraction. The veteran sellotrap player may use tactics such as alluring screensavers or desktop backgrounds to divert the trapee's attention. WARNING - it is best to keep sellotraps above knee level (especially tripwire sellotraps) in order to avoid injury, death or unwanted lawsuits due to trippage.

Mr Butler: I say, there appears to be something stuck to the top of my balding pate!
Mr McDowall: What splendid fun, my sellotrap hijinks have worked a treat!
Ms Hobbs: You chaps had better get back to work lest your backsides meet my beating stick at speed.

sellotrap by AlvinSimonTheodore January 6, 2008

mainstream sellout 

The sixth official studio album by machine gun Kelly

Mainstream sellout fuckin rocks

mainstream sellout by Jaydubhs March 7, 2022

SellouticA 

When the band Metallica became less metal. They were influenced by the 90's grunge era and their music lost it's metal edge. Their music became very commercial. Many metal fans abandoned them.

Is that the new Metallica song? No, you are listening to Selloutica.

SellouticA by Rad Nick April 18, 2019

Sellers Effect

When, in a memory, one's friend is replaced by one's romantic partner.

"My girlfriend was telling me about this John Cale album I think you'd like."
"Are you joking? I was the one who told you about Paris 1919. You're a victim of the Sellers Effect."

Sellers Effect by Neil Porkchop October 4, 2023

Indian Seller 

A person who proposes that you buy something from them, but upon agreeing to buy, loses all interest in selling their item.

Similar to the definition "Indian Giver" however there was nothing that had been exchanged in this instance.

Typically people who do this have no male genitalia, and abuse the item that they possess by dowsing them in semen...In these instances you're better off keeping your money upon a time comes that you can actually buy an item that isn't riddled with baby batter.

Here is an example, with a name typical of an Indian seller.

David Gregson: "Do you want to buy my iphone?"

Awesome Guy: "Yes"

David Gregson: "I don't want to sell it anymore, I still haven't finished dowsing it in semen"

Awesome Guy: "F**K*NG INDIAN SELLER!"

David Gregson: "Call me names as much as you want, I cant hear you whilst I'm fornicating with my item"

Indian Seller by Potential Buyer October 11, 2012