The over-used phrase that ditzy teenage
girls use to talk about a "super fun night" or "hilarioussssss pictureeee", not realizing that it makes them sound like they have 8 brain cells. Oftentimes, it's combined with other
words to make phrases such as, 'BEST.PICTURE.EVER.' Also, 'BEST.NIGHT.EVER" can be seen and/or heard quite frequently.
Can be mistaken for 'BEST EVERRRRR' which is essentially the same
thing, just a more obnoxious and emphatic version.