dry tanks
to have ejaculated so often over a short period (either through masturbation or sex) that you have little or no semen left in your testicles (the 'tanks') and thus will hopefully be able to last longer before cumming again
"Despite having dry tanks before taking this girl home, she was so amazing I came really quickly."
dry tanking
taking a crap in the toilet tank of a person you hate, preferably at a large party. the owner of said tank, upon sniffing the crap, will flush to no end until they realize they are flushing the unflushable.
my cheating ex had a party and so i snuck in and dry tanked her. i heard through the grape vine that she flushed for three days straight to no avail. dry tanking is the best!