Definition
to schedule in a calendar
to sign a document to hire someone
See Also
How People Actually Use It
One can "ink in their pants" when they are very excited. It is interchangeable to "getting a boner" but "ink in my pants" can be used by both sexes.
"I nearly inked my pants when I saw Dave Matthews at Red Rocks. Watching that stripper do the splits at Shotgun Willie's made me ink in my pants."
Source: Urban Dictionary