Fuck and Dump:

after a night of sex with a one night stand, you drive to the store to "pick up something to drink." send the person in and take off while they are inside.

Self explanatory. After having engaged in sexual intercourse and/or activity, either one or both of the individuals come to an ultimatum in which they terminate the relationship that had brought them to such a level of intimacy. Basically, one of the bastards gets cold feet and walks out on that other bitch's ass.

when the person youve been screwing, not dating, says you two shouldnt fuck anymore.

When you’ve finally had it with a place that really sucks.