It's not really a euphemism - it's a metaphor, and means deciding to cry in order to manipulate others. It is used only when referring to women's behaviour. A (stereotypically pretty) woman who is caught speeding might try to avoid a fine by 'turning on the waterworks' to evoke the sympathy of the police patrolman.
The expression "turning on the waterworks" means to start crying or weeping, often in an exaggerated or insincere manner. It is typically used to describe someone who is attempting to manipulate or gain sympathy from others through their tears.
The Waterworks was created in 1994.
Decatur Waterworks was created in 1906.
Brooklyn Waterworks was created in 1891.
Unadilla Waterworks was created in 1891.
Lockesburg Waterworks was created in 1936.
Brede Waterworks was created in 1904.
Waterworks is a very fun water park in the state of Virginia.
A discharge pipe with a valve and spout at which water may be drawn from the mains of waterworks; a water plug.
Montevideo Waterworks Company ended in 1948.
Montevideo Waterworks Company was created in 1879.
Ottawa Waterworks Building was created in 1904.
Lambeth Waterworks Company was created in 1785.