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1.
The act of swaffling (smacking your penis against something) fast and furiously between a woman's breasts. Similar to motorboating but with a penile element.
You could motorboat your girlfriend, but may derive more pleasure from pontooning her instead. Just make sure it is ok to ejaculate in her cleavage before doing so.
by Ryanandluciana April 23, 2013
 
2.
To float around the true meaning of a word or phrase.
Pontooning around the word love, Debra said , I really like you.....alot....really , I like you tons...
by Sonorliter January 24, 2011