Overused internet saying, started by the Clock Crew. It's meant to be a substitute for LOL, because Dwarfinator got banned for saying LOL on the NG boards. Taken from a costume company in the Halloween movies.
Silver Shamrock, that's awesome!
When performing a four leaf clover using the mouth, and all four dicks cum at the same time.
Cindy was getting the ol' four leaf clover and ended up with a Shamrock Shake.
When you insert a four leaf clover into someone’s asshole and you fuck them with the four leaf clover still inside. It’s best to cum while still inside to give it that shamrock shake feel.
“You keep talking to me like that I’m finna give you a shamrock shake!”
When you take a shit and it comes out green. Similar to the McDonald's shamrock shake.
Tom: Have you ever taken a shamrock shit?
Jenny: Only when I eat ham and cheese.
When a Irish bitch gives you a wet tit-job in a McDonald's (usually in the restroom but if your lucky, through the drive-through window)
Person 1: "Yo I got a Shamrock Shake at the local McDonald's bathroom."
Person 2 'Why in the bathroom?"
Person 1 "What."
Person 2 "What?"
This is when a person dyes their pubes green and then has the partner cum on the pubs. After the cum settles the partner then consumes the solution.
“The shamrock shake I had last night was delicious!”
a cum shot
She took the shamrock shake to the fact