If someone is asking you for a ride and you don´t feel the need to
give it away for nothing, it´s a good
opportunity to ask for "ass, gas or grass".
Meaning you wish to take advantage of the situation by getting
a good fuck, some bucks for the gas you´re gonna need or at least something to get a buzz from.
(Maybe one of you might describe it better, as I´m by no means a native speaker!)