"Dutch courage" (booze-induced bravery)
"Double Dutch" (gibberish)
"Double Dutch" (usage of condom in combination with the pill)
"Dutch cap" (contraceptive diaphragm)
"Dutch wife"/"Dutch widow" (prostitute; sex doll)
"In Dutch" (in trouble)
"Dutch comfort" (saying that "Things could be worse!")
"Dutch gold"/"Dutch metal" (fake gold leaf or fake gold)
"Dutch treat"/"Going Dutch" (social date where the invitees pay for themselves)
"Dutch concert" (noise and uproar, as from a drunken crowd)
"Dutch-bottomed" (empty)

Expressions:
"Where a Dutchman has passed, not even the grass grows anymore" (Japanese saying)
"A Dutchman is a Lusty, Fat, Two-legged Cheese worm. A Creature that is so addicted 
 to eating butter, drinking fat, and sliding (skating) that all the world knows him 
 for a slippery fellow" - English pamphlet