A sideberry is an extra Blackberrythat one carries with oneself for work or BBM purposes. It is not as cool as other phones such as iPhone or Nexus S but is still needed for its unique functions.
Yo Simz, I just BBM'd you on my Sideberry get back to me when you have a minute my borther.
A player variation of a blueberry in Destiny 2 that tries to speedrun any instance they come into. Usually lacking the skills or gear to properly speedrun and getting themselves killed in the process commonly.
Another trait of speedberries is ignoring the enemies and rushing towards the next checkpoint, pulling the players left behind (usually only just loaded in to the mission) into the new section and causing annoyance.
The ancient history of the Seaberry name begins with the ancient Anglo-Saxon tribes of Britain. The name is derived from when the family resided in Sebright in the county of Essex which was later known as Great Seabright in Great Beddow in Essex.