In dorm lingo, implicit differentiation was a term for making out, or 'second base' if you will, and 'Explicit differenciation' was the term for other things. 'Integration' (or the interval of E to the X) was sex.

here's the blurb for Implicit Differentiation:

IMPLICIT DIFFERENTIATION

I got a d in calculus, failed trigonometry
cant factor vectored inegrals, and one plus one just seems like three
and i despise articulating all this useless calculation
cuz girl you know that all i need is your implicit differentiation.

The oscillation of a double sine curve's all i really wanna see
The integral of e to the x is where i wanna be
an i know one day we'll find ourselves in integration
cuz baby i just love your implicit differenciation