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7.
The act of masturbating while someone chainsaws you
This chick blew my mind; we were lumberjacking all night!
by ChainsawGoddess October 23, 2010
 
1.
The act of masturbating whilst watching someone else take a shit, or the act of taking a shit whilst someone watching masturbates
Man, my wife is a dirty bitch - we did some serious lumberjacking last night! She squatted over a glass coffee table & took a shit while I was underneath, masturbating furiously!!
by Jack Shit II March 31, 2007
 
2.
The highly disciplined art of simultaneously defecating and masturbating.
One thing Cliff really enjoys is a good lumber-jacking.
by Douglas Thorneloe January 20, 2008
 
3.
Taking a shit while at work and getting paid for it
phone txt ** sup bro? reply: nm bro just lumber jacking
no shit? reply: exactly!
by bigbonza August 04, 2012
 
4.
When you're in a public transit, like a bus or train or plane, you pull out your penis before the person next to you sits down and you put it under them with out them knowing.
Marc: Hey Nathan, do you remember that time i lumber jacked that chick on the bus?

Nathan: Yeah, lumber jacking is totaly awesome!

Marc: Haha that was hilarious, why don't you come sit beside me nate?

Nathan: Sure, i don't see any harm in th...awww why's my seat so hard?
by Adam Demamp November 03, 2011
 
5.
Whilst Double Penetrating a girl, The dick in the ass goes in as the dick in the pussy comes out. Like the old school saws that the lumberjacks used back in the day.
Dude, last night, me and my homeboy were totally lumberjacking that bitch. We had her screaming everything with our perfect form!
by Spcmmr January 03, 2011
 
6.
Another term for "cock blocking" except the offending person, or item is actually "killing your wood" because it is distracting you and/or so repulsive you could not possibly be aroused while you are thinking about it.
Dude, I love this truck but the purple color is totally lumberjacking my game.

Did you see her ugly friend? As long as she was around she was lumberjacking me while I was hitting on the hot one.

We were eating at this fancy restaurant, but watching her eat snails totally lumberjacked me
by TommyGunz519 September 18, 2011