Performing various acts of little added value. Can be used in place of "tinkering around."
Anne: What did you do today?
John: Ah, nothing much. Just tinky fucked around.
Anne: Tyler is so worthless.
John: Yeah, he's a real tinky fucker.
Anne: John, we have to get shit done. Stop tinky fuckin'.
To make an unforgivable, or unforgettable, mistake; A total dealbreaker.
John: Hey! Wanna' come over tonight?
Anne: No.
John: What do you mean, no?!
Anne: I saw your texts to Jane. You fucked the pooch. You're dead to me.
Anne: Talley still hasn't paid me my money. Guess I'll have to call my lawyer.
John: Yeah, the dude really fucked the pooch on that deal.
Anne: I didn't mean to overdraft our account!
John: Well, ya' did. You've fucked the pooch this time, Anne.