drop your knickers:

To have or to prepare for sex intercourse . Chiefly British usage.
See Also: Alan Whisker(s), backs against the wall!, backs to the wall chaps!, drop anchor down the booby hutch, drop anchor in the bubby hutch, drop beads, drop one's beads, drop one's cookies, drop ones load, drop the plate, jilt, lemon, morning dew drop, morning drip, pearl drop, shell-like

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