If the coffee is just slopping about within the cup it's light. If it's slopping out of the cup it's moderate. If you cant find the cup it's severe.
That one goes on my "quotes to memorise" list. Thanks TB!
Just an extra thought. If you do go too fast in turbulence, don't expect anything to "break". What will happen is reduced airframe life and possibly some very slight bent parts, by no means necessarily the wing itself. Airframe abuse is often insidious and hard to detect.
But I continue to use turbulence penetration speed to penetrate moderate turbulence, assuming of course I haven't been able to avoid it. If it's not quoted, I guess Va is a close approximation, even if you're one of the nine out of ten pilots* who don't factor it for aircraft weight at the time.
* Personal experience from examining. Present company excluded, naturally!