1. Lemon

• Meaning: A vehicle that does not work properly
• E.g. The car dealer sold me a lemon.

2. When life gives you lemons, make lemonade

• Meaning: Focus on the good in a bad situation and take action accordingly.
• E.g. While I was devastated to lose my job, being unemployed gave me the time to finally go back to school. When life gives you lemons, make lemonade, right?

3. (go) suck a lemon

• Meaning: An expression of anger, scorn, or disdain. Primarily heard in US, Canada.
• E.g. Charles: "You never do any chores around the house, you just leave them for the rest of us!" Sam: "Oh, go suck a lemon, Charles! I don't have to listen to your crap."
• E.g. I can't believe you told your teacher to suck a lemon after she yelled at you.