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1.
A combination of the names Robert & Kristen ( Pattinson & Stewart )
Ow, I saw Robsten yesterday... on the set of NEW MOON ! :o
by HisGoldenEyesForever April 12, 2009
 
2.
The collaberation of the two Twilight stars, Robert Pattinson and Kristen Stewart, who started dating shortly after the the film released.
Robsten is sooo the new brangelina!
by KOqueen3000 September 23, 2009
 
3.
The pairing of Robert Pattinson and Kristen Stewart in love and lustly matrimony. They are forever to be in love, and Micheal Anagarnoaodi can fuck his dog. He has acne.

Sky High is a slut.
Meant to be together. Robsten.
by PEPPYLOOOOOOOO July 03, 2009
 
4.
Robsteners or Robsten shippers are always (huge) Kristen Stewart fans and Twihards! They're interested in the (supposed) love life of two people (Kstew and Rpattz) they’ve never met. They think they’re “meant to be” but are pulled apart or told to keep their love hidden by secret unseen forces aka the big bad movie studio who they’ve turned into the villian along with the media, their management, paparazzi, Nikki Reed, Emilie De Ravin, Ashley Greene, Camilla Belle, Tomstu, ...... and anyone who opposes their opinion. They can't separate reality from fantasy! They are crazy and obsessed!
Robsten fans are crazy and obsessed!
by robstennonstencrapsten August 18, 2010