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In the dating realm, “FB” stands for “f*** buddy” or “friend with benefits,” which is someone you have a sexual relationship with but aren’t technically dating. Basically, no emotional attachment or commitment is involved. You enjoy each other’s company and have some fun without any strings attached.

So, for example, “fb friends” mean Facebook friends, or “fb posts” mean Facebook posts. When used as a verb, “FB” can also mean interacting with someone via Facebook. So, if you are “fbing” something, you’re posting it on the website or sharing it through the site’s messenger. But Facebook isn’t the only thing that “FB” can stand for.

The fb, or fraction of bound drug, is useful for determining fu, fu = 1 - fb. 306    Chapter 11 12. Adenosine is extensively taken up by cells including the blood elements and the vascular endothelium.