laugh out of the wrong side of one's mouth

intransitive verb

1. to make the explosive sounds of the voice, and the characteristic movements of the features and body, that express mirth, amusement, ridicule, etc.
2. to be amused
3. to feel or suggest joyousness; appear bright and merry: laughing eyes

Origin: ME laughen < OE hleahhan, akin to Ger lachen (OHG hlahhan) < IE base *klēg-, to cry out, sound > Gr klangē, L clangor

transitive verb

1. to express or say with laughter
2. to bring about, effect, or cause to be by means of laughter: to laugh oneself hoarse

noun

1. the act or sound of laughing
2. anything that provokes or is fit to provoke laughter
3. Informal mere diversion or pleasure