Lemma

(noun) A slang word that is used when talking about an issue, problem, or dilemma, but don't want to use a word as harsh. The meaning is similar, but the connotation is lighter.

This word is similar to "dilemma", but is not derived from that word.

Ron: "I have an issue."
Sam: "Do you know the solution?"
Ron: "Yes."
Sam: "So... what's the lemma?"