(v.) The act of giving oneself manual stimulation or pleasure via hand and penis. It is done by stroking oneself repeatedly; masturbation; jacking off.
Matt: Yo where have u been this last hour?
John: Just catching up on my reading.
Matt: Bullshit, you were probably jeffin it
John: You got me
John: Just catching up on my reading.
Matt: Bullshit, you were probably jeffin it
John: You got me
by willemdafoe April 25, 2012
Get the Jeffin Itmug.