“I’d tap that”
This phrase is a condensation of the colloquial expression:
“If only I could
tap and sell that.” -or-
“You could
tap and sell that.”
The expression is derived from the practice of tapping a keg of
beer, or cask of wine; –whereby a spigot valve is inserted into the side of the keg, in order to
tap the
beer.
The expression figuratively means: “To access something of value”
In the last decade, the expression has been further condensed to simply:
“You can tap that” -or- “I’d tap that”
It is often used in conjunction with a sexual connotation.