A joining of the four non-thumb fingers, like a horizontal high five, with fingers straight and interlocked, met and squeezed. Most common use: congratulations. Can also be romantic or supportive, a gesture between friends, signifying solidarity.
"Good joke, dude, fingerlock!"

"I'm glad you came, babe, fingerlock me."

"Sweetheart, you'll be okay, fingerlock and forget!"
by Tubetop2012 July 10, 2012
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The typing-equivalent of tongue tied, in which you either can't think of the word or are too stunned to type what you wish.
Example 1:

Stephanie: I'm pregnant!

*5 minutes pass*
Stephanie: Hello?
You: Sorry. I was fingerlocked for a second.
Example 2:
Elizabeth: That was so...
Val: So what?
Elizabeth: Umm... that word.. Like rednecks and mustaches meaning evil people.
Val: ... Stereotypical?
Elizabeth: YES! God that was stupid of me.
Val: Way to get fingerlocked. xD
by CantThinkOfANameThatsNotTaken December 29, 2011
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