1). A playful phrase spoken to friends as a term of endearment. The phrase "your a thumb" roughly means "your dumb" and is spoken to friends to emphasize their flaws, in a loving way.

2). The phrase "your a thumb" may also mean "you have a big forehead"

1) to pray or implore; 2) to safeguard against failure; 3) to think of something; 4) to try to express an idea; 5) to look exasperated; 6) to appear hungry; 7) to eat a meal; 8) to satisfy a requirement; 9) to have the right stuff; 10) to check oneself

When you talk shit about someone through Twitter or similar sites.

A text message most commonly sent to some one who has suddenly stopped replying in a text message conversation.

When someone doesn't text you back after you text them, you text them "cat got your thumbs?". It's a play on "cat got your tongue?", which is an idiom used to compel someone to speak who is unusually quiet.

–adjective 1. temporarily deprived of the ability to think of a resonce, while texting, by strong emotion, physical weakness, exhaustion, etc.

an expression of surprise caused by the failure to respond by the other half of an SMS conversation