friendship hit

The last possible hit of a bong after people think it's cashed which you give to someone to prove their friendship to you.

ex 1:

MacLovin': Is that tots cashed?
Caitlin: There's a friendship hit in there.
MacLovin': *cough cough cough*

ex 2:

Caitlin: Is that tots k-ed?
MacLovin': Are you my friend?
(Caitlin is).