Grand-Slammer 

The act of having sexual intercourse with somebody who makes it taboo, or the act of fuckin your homies older sister 😈

Yooo bro I hit a grand-slammer last night I think I got Sams sister pregnant 🤫

Grand-Slammer by alabamaslamjammer25 April 3, 2020

Klamath Grand Slammer 

When the second cock doesn’t knock your Copenhagen out of your mouth.

After three Klamath Jammers, he finally managed a Klamath Grand Slammer!

Klamath Grand Slammer by The Natist June 11, 2021

The grand slammer 

The grand slammer is when you do a line of coke off a girls belly, kiss the girl, take a bong rip, take two syringes full of tequila then make out with a second girl and she slips a ecstasy pill from her mouth to yours. Then you die.

Yo man! Nick just did the grand slammer, his buddies had to take him to the hospital.

The grand slammer by Mickey dog November 20, 2014

Grandslammed 

When you make yourself cum so good that you need to go to a major restaurant chain and buy yourself breakfast .

Wow .. I needed that ..I totally Grandslammed .. See you in an hour I'm starving .

Grandslammed by Saneand71 June 25, 2016

grandscammer 

grandscammer means in any field,there are scammers,but in some cases,it referring to scam behavior in chess product. Grandscammer is a noun that describe someone who the first person to sell some free chess product to make money. And misinformed a lot of people to buy their product.

Albert Silver,it is said he is the grandscammer of chess,who literally doesn't know how to code but magically developed chess bot fat fritz, and thousands of people are fooled by it,fat fritz,which is another chess bot Stockfish's clone,who is not stronger than Stockfish.But sell it for commercial product.

grandscammer by JLLQ July 26, 2021