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!