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.
High school girl sees a picture of herself drunkenly posing with her friends on Facebook: "hahaha omg! best.EVER."
The most true and stripped down raw level of perfection achievable, in any situation attainable. Can be achieved by the satisfaction of contentment in a particular moment.
What your ex calls you after he/she realizes that you are the best he/she will ever have, because you treated them so damn good when you were together. No one will ever compare.
As her new boyfriend, my job is to be the best she's every had or will ever have, so she'll one day call me her best ex ever (B.E.E.). She'll be ruined on all other guys henceforth.
Pajama casual is a term used when working from home and preparing for a video conference. All business above the waist and your pajama pants down below.