(only if you're a boy) When you have sex, you lick both your thumbs and jab them in the woman's vagina continuously. This widens the vagina so it is easier to continue with the sex session. Try multiple times to make vagina wider.
Person 1: "Did you do the DOUBLE THUMB last night?"
Person 2: "Yes, and my girl was hurting the next day."
Person 1: "Sweet!"
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Texting on two mobile devices while holding one in each hand
"I saw this crazy girl at the club last night. I was going to go talk to her, but she was busy double thumbing at the bar."
To take two thumbs up the butt at the same time. Sometimes with out warning.
Bro, last night I got a double thumb gipster
When something sucks major ass, or is not cool.
Its double thumbs-down fart noise when you have to clean "mess" your friend left after fucking your mom.
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When one's thumbs shake, quiver, and hurt at rest due to over-texting. Usually a result of unlimited texting plans. It becomes easier to text than to actually speak to someone. Inflammation grows within the joints of the thumb and may cause swelling. May occur when dating someone extremely younger than oneself, or possibly a cougar/manther on the prowl in silent mode. Even a simple thumb's up can cause severe pain.
Manther: Ever since I've been dating this freshman babe, my thumbs hurt. Is it cause I've been jerkin off too much?
Manther Friend: When's the last time you actually talked to her?
Manther: Dude, now that you mention it, like a month ago...she only texts me all day long.
Manther Friend: You have double text thumb arthritis yo!
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when all fingers are clasped together, this leaves both thumbs together in an upright position. Insert the thumbs into your partners rectum, pull them out. Insert your penis into the rectum, reach around and stick your thumbs in their mouth to be sucked.
I tried to give my girl the double chocolate thumb pops last night but, she shit all over me in mid act.
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To receive two thumbs up the butthole at the same time. Could happen with or without notice. Can be performed by one or two different people.
Bro, last night Mike and Ryan slipped a double thumb gipster