A man's personal, private parts - the genitalia, more specifically the penis. May also describe a condition of tumescence in said organ.
Bob's pants were ill-fitting, they compressed his chubmarine with unbearable pressure.

Jesse wished his girlfriend would pay more attention to his chubmarine when they attended the drive-in theater.
by kittywords June 16, 2009
Having a boner under-water.
While swimming, I saw a girl in a bikini and got a chubmarine.

alternate : Asian with a boner underwater is a "yellow chubmarine".
by Schmelvin Han May 01, 2013

Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from daily@urbandictionary.com. We'll never spam you.

×