When you don't know the answer to a question or command you reply with tits.

To end a conversation awkwardly.
Jack: "Hey John what time is it?"
John: "Uh..."
John: "Tits!"
Jack: "Haha When in doubt...Tits my friend!"
by Pat G Lax July 08, 2010
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This is when one person asks another a question and neither of the two people know the answer. Therefore the "smarter" of the two people may suggest using Google.
me: hey billy how many licks does it take to get to the tootsie roll center of a tootsie pop?

Billy: Idk, How many?

me: Idk either?

Billy: When in doubt google it
by nitsuj0207 June 26, 2010
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"It" is referring to showing your male genitalia to a certain lady (or guy if that's what your into).

This is the common reply you give to your friend when he continues to complain whether a certain girl is into him or not.

It's the ultimate test. If the girl doesn't take bait or if she's about to charge you for harassment, proceed to walk out the door and move on.
Pete: Hey Billy, Sara gave me a wink yesterday, but sometimes she doesn't seem interested in me.
Billy: Bro, when in doubt, whip it out!
by Notorious NATE October 12, 2010
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Blaming someone who will take blame without an argument, or go along with something so you don't have to face the consequences of your actions.

Your friend that is funny to blame things on, your *taul*
you - "hey baby wanna come over and get freaky?"
girl - "uhh nooo, are you serious?"
you - "sorry! that wasn't me, taul had my phone."
girl - "oh okay! what a weirdo!"

friend - "good save brother!"
you - "yeah man, when in doubt, blame taul."
by shanebabyfresh December 31, 2010
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