Top definition
to write something with your thumbs, most typically on a cellphone or other handheld pda.
Hold on a sec, Phil, I just got thumb out this text and I will be ready to go.

I was trying to drive, change the song and thumb out something on my phone at the same time; that's why I didn't see you.
by JakeinthedirtyD March 15, 2011
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It does not matter how you do it. It's a Fecal Mustache.

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