A snack or morsel of food that does not constitute a meal. / Something special such as a gift or extra money. / A situation. / A sexual encounter. / An affair or extramarital sexual partner.

Replaces parts of a sentence a speaker either does not know or deems unimportant; blah blah blah.

Alternative form of something-something

Ellipsis of something is rotten in the state of Denmark.

(nonce word, informal) Something believed or claimed to be unimportant that turns to be of some importance.

Some importance to.

(archaic) To ruin something; to make a severe mess of something.

To transform (an object or person) into something worthwhile. / To develop an understanding or interpretation of.

Alternative form of you don't get something for nothing

One cannot expect to receive some benefit if one does not pay for it in some way or does not face a counterbalancing hazard or harm.