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Similar to "motor-boating", "Tugboat" refers to the sound and tone while in the 69 position, whereas the buttocks replace the breasts.
Last night, Mary and I were 69'ing on the couch, and I totally gave her a "tugboat" as I finished.
Tugboat by Davers67 January 16, 2008
While outboarding a man, you give them a reach around or handjob.
My gym teacher let me skip ourn fitness test because I gave him a tugboat, and I think it was a fair trade.
tugboat by fatwreck138 February 28, 2009
1. A person of short stature that has a little extra in the belly area there for resembling the small but powerful aquatic vessel from which they get the name.

2. A person who enjoys giving hand jobs.
Jeff "The Tugboat" got his nickname from the fact that he closely resembles a tugboat.

Jeff keeps his job because he is a tugboat.
Tugboat by tabb9512 October 8, 2009
The one friend that every one has. That acts like he is slow but he really isn't and laughs at every thing that makes no sense.
Stanly "Last night was fucking nuts"

Ryan " hahahaha yo, that was SO SICK!"

Stanly "fucking tugboat"
TugBoat by Flat Stanly November 29, 2011
The sound one one makes while performing fellatio. Or just the act itself
Nessa gives some great tugboat!
Tugboat by Mike Sogoff December 15, 2004
a boat that tugs.
]*+-_^:. wELcoMe to #netsplit Cactuar hOw mAy i Be oF aaSiTenCE? | IF you aRE a TUGBOAT, NO ASSISETNEC MAY ASSITED. SaVe the yETTIS
tugboat by Cactuar November 20, 2003