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1. This is when you get a random erection.

or

2. When joking with your mates.
(also see 'Marley')
1. "OMG i have a Bob On, i hope no one sees!"

2. "OMG i just gold stared Run to the Hills on Rock Band, i have such a Bob On!"
Bob On by SGregz October 27, 2008
It is Bob on 4 o'clock
"Did you cook too much?" "No, everything was Bob on, sorry no leftovers."
I guessed the weight and it was Bob on 400g
Bob on by Fabian1992 December 18, 2022

bob on it 

Boss: I need you to come in on saturday to work a double shift.
Dude: I need you to bob on it
bob on it by Mike Kempner August 2, 2006

bob on the d 

Bob on the D- the act of bobbing on the dick

V. blowjob
Adj.
"Hey Yo Crack she bob on the D man?"
bob on the d by ike71 December 30, 2006

bob on nob 

bob on nob by Anonymous July 10, 2006

bob on my knob

teacher: you need to study harder
me: you need to bob on my knob
bob on my knob by Psycho August 10, 2004