A campfire is a blue portal with 8 x level 1 resonators placed as close to the portal as possible and 4 useless mods like link amps. Then the portal gets ada-ed. The term campfire comes from the look on the scanner from all the yellow resonators as logs and and the blue as flames. Typically a campfire is created by a Enlightened player to annoy an Resistance faction player.
Also known as a Lada or Pineapple.
The last sentence belongs in the "pineapple" dictionary entry, no?
D'oh, originally we had one entry for both pineapple and campfire and I split them into 2 entries and made a mistake when cut-and-pasting. Thanks for letting me know.