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Passenger (usually male, usually young) unable to occupy a seat on a suburban commuter train without spreading his legs wide open (as though suffering from severely swollen testicles) and so encroaching on the adjacent seat.
I boarded the 18.23 train and moved to the quiet car only to find a grupnik sprawled across the last available seat
grupnik by Wordsmithz December 25, 2008
Related Words

Gruppenfücker 

Reserved only for the worst of the worst. People labeled as such are worse than assholes, dumber than idiots, weirder than spergs, more annoying than Bieber, more heinous than villains, and more disgusting than public bathrooms. Most likely all of the above.
get the fuck off the fucking computer, lethargic gruppenfücker
Gruppenfücker by Yopmail User June 25, 2022
A rare mineral that has developed a mental disorder, usually being down syndrome or HDMI (ADHD).

Could also be referring to a mineral deposit that has formed inside the reproductive system of a female, usually over the age of 55.
Guy 1: Dude, why did you change your name to Gyruss.

Person 2: I love vagine rock

gruppe sechs 

The security van appears in the infamous Grand Theft Auto III and Grand Theft Auto: Vice City video games. Apparently a take on the well-known financial entity called "Goldman Sachs", while it is also phonetically similar to "Group Sex", a sex-oriented pun indeed. Very Rockstar style.
All the blue security vans in Liberty City belongs to the Gruppe Sechs company.
gruppe sechs by Lin T April 16, 2006

gruppe sechs 

The name of the security company in Grand Theft Auto: Vice City.

When sounded out phoenetically it is "Group Sex"
The Gruppe Sechs truck is usually locked, and difficult to steal without a police uniform.
gruppe sechs by brahm2 September 28, 2003
A grown-up in the minority, finding themselves among younger people. Coined by Adrian Spies, writer of the Star Trek episode featuring a post-apocalyptic world where only teenagers survived.
It's a kid's game chiefly, but you can find grups playing too.
grup by Redrum Frank August 12, 2005