Biden time is an alternate version of standard time where one (typically Joe Biden) will show up anywhere from 30 minutes to 2 hours after the agreed upon start/arrival time.
Person 1: Hey! Have you seen John? He was supposed to get to the meeting at 02:00.
Person 2: Nah, he won't get here for at least another hour.
Person 1: Damn, he must be on that Biden time.
Receiving messy oral from somebody you definitely don’t want to admit you got it from; or, receiving oral from somebody who may or may not be all there
“Yeah, last week she came over and came me the ole Sloppy Joe Biden”
“You got an SJB from them?”
“Yeah, just keep it to yourself but it was great”
When you get a question on your exam right, and moan “oh ya joe” in the middle of class
I got the hardest question right and I did the Biden brilliancy