Definition:
"Flake" is a slang term used to describe someone who is unreliable or inconsistent.
Use case:
You can use this term when referring to someone who frequently cancels plans or doesn't follow through on commitments. For example, "I can't count on him to show up on time, he's such a flake."
• He's always flaking on his responsibilities, it's time he got his act together.
• She said she would help me move, but she flaked out at the last minute. I had to do it all on my own.
• I invited him to the party, but he flaked and didn't even bother to let me know.
• I can't stand working with him, he's such a flake. He never shows up on time and always has some excuse.
• Don't be a flake, show up to the meeting on time.
• She's a flake when it comes to making plans. I never know if she's going to show up or cancel.