[up one's sleeve] or [in one's sleeve] {adv. phr.} 1. Hidden in the sleeve of one's shirt or coat and ready for secret or wrongful use. * /The crooked gambler […] A Dictionary of American Idioms

laugh up one's sleeve

[laugh up one's sleeve] or [laugh in one's sleeve] or [laugh in one's beard] To be amused but not show it; hide your laughter. * /He was laughing up his […] A Dictionary of American Idioms

wear one's heart on one's sleeve

[wear one's heart on one's sleeve] also [pin one's heart on one's sleeve] {v. phr.} To show your feelings openly; show everyone how you feel; not hide your feelings. * […] A Dictionary of American Idioms

card up one's sleeve

[card up one's sleeve] {n. phr.}, {informal} Another help, plan, or argument kept back and produced if needed; another way to do something. * /John knew his mother would lend […] A Dictionary of American Idioms

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Chinese proverb

Beat your child once a day. If you don't know why, the child does.

to foul one's own nest

[to foul one's own nest] {v. phr.} To compromise unintentionally one's own interests by sharing private information […]

slap-head

[slap-head] {n.} {adj.} A bald man.

Generica

[Generica] Fast food joints, strip malls, sub-divisions as in "we were so lost in generica that I couldn't remember what city […]

[GJ] "Good job", often sarcastic

from rags to riches

[from rags to riches] {adv. phr.} Suddenly making a fortune; becoming rich overnight. * /The Smiths went from rags to riches […]

off the wall

[off the wall] {adj. phr.} Strange; out of the ordinary; stupid. * /He has been making off-the-wall remarks all day; […]