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Runster is a word that the beloved Hannah Barbara cartoon characterScooby-Doo” pronounces the word “Monster”,
Scooby: “Raggy, RUNSTERS!!!!!!! RUNSTERS!!!!!!!!!

Shaggy: Oh no scoob!!!!!!!! (Screams)
Runster by Dozy_Leo November 10, 2019
Related Words
Ronster is formed by contracting the first name Ron with the word monster.

It is a nickname (or adjective) for a person (or thing) of a person named Ron.

In usage, Ronster, like monster, may be used in either its sense as a noun or adjective.
Nickname: Ronster for a person (or thing) of a person named Ron.

Adjective: Ronster may be used as a descriptive term of endearment, mild annoyance, satisfaction, disappointment, or indifference for a person (or thing) of a person named Ron.
Ronster by Randy Johnsonrod January 29, 2007

Pulling a Ronster 

To have sex with 6 playmates at the same time.
Me: Dude, my wife caught me pulling a ronster!
My friend: You slept with 6 playmates?!!!
Me: I'm shittin you not!
Another term for a huge dildo.
Excuse me, does this porn shop have any rugsters? These 16 inchers aren't big enough.
rugster by IH8MUD March 20, 2006

rusterucci 

The coolest name out there. An Italian name not a Mexican name. People with this name hate it when people call them Mexican.
Rusterucci is a better name than Mexicans last names.
rusterucci by Wafflehouse77 April 17, 2017
𝘿𝙤𝙣𝙩 𝙁𝙪𝙘𝙠 𝙒𝙞𝙩𝙝 𝙏𝙝𝙚 𝙍𝙤𝙣𝙨𝙩𝙚𝙧
i love ronnie radke “ 𝘿𝙤𝙣𝙩 𝙁𝙪𝙘𝙠 𝙒𝙞𝙩𝙝 𝙏𝙝𝙚 𝙍𝙤𝙣𝙨𝙩𝙚𝙧” “do not fuck with the ronster”
ronster by emmasyko September 13, 2020