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2.
To tell someone to get over something. To get over it.
Mark "I can't text you because it costs money."

Margie "It's only ten cents, get off the boat."
by Christa H June 08, 2006
 
1.
1. The phrase you tell someone when they are going too far with a subject and/or arguement and they need to let it go.

2. The phrase you tell someone who tries to enter a conversation that they aren't a part of.
1. Jim: "Your hair looks stupid today."
Billy: "Your MOM looks stupid!! And so does your father and your brother and your sister!"
Jim: "I was just saying."
Billy: "And your aunt and your cousin and your grandmother!"
Jim: "Dude this was over five minutes ago get off the boat."

2. Mary: "Dude that concert was so awesome last night!!"
Jill: "I know right!!"
Mary: "...you weren't even there. Get off the boat."
by mightywheaties April 05, 2011