When you have no
weed left and you're really desperate you can
cop for X amount of
weed. (normally a set->7)
Copping for 7 is the action of letting a police officer touch your
penis with a single index finger for a preset amount of time agreed among the two parties in return for marijuana.
Normally a 1 second touch is equal to a gram , therefore 7 seconds equals 7 grams, but this is subject to change as inflation rises and weed prices vary.
To signal an officer the buyer normally puts his arm up and lifts an index finger showing that they are up to cop.
In rare events police officers will ask people if they would like to cop for some
weed but this is rare seeing as cops want to keep the
weed they've confiscated all day to themselves