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3.
the best feeling in the world, usually associated with feeling free and happy.
"dude, i just got an A+ on my science test, i'm on a boat!"
by deejaylovesmaddie December 14, 2009
 
1.
Title of a great song. (Lonley Island and T-Pain. If someone says this they are either listening to the song; is on a boat;or"im so good you cant touch me" or "im on roll" kinda thing.
(Someone is on fire in a basketball game) "DUDE,YOUR ON A BOAT!"
by NikkiStatic February 26, 2009
 
2.
An alternative way to say "on a roll". Things are going incredibly well for you and nobody can touch you, because you're on a motherfuckin boat.
I just got promoted at my job and scored a hot date tomorrow, I'm on a boat!
by Heeb21 February 13, 2009
 
4.
1. To be high as shit. 2. To be so high, it feels like one is floating.
"Dude we need to get going" "I can't man. Im on a boat nigga!"
by Mr. Flinstoned May 06, 2010
 
5.
when you are completely "tanked" or drunk you tend to have no balance....as if you were on a boat.
You say "dude, I'm on a boat" then lose your balance and fall the hell on your ass.
by drinkycrow July 06, 2010