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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
 
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