ream
1. to prepare the ass for anal intercourse, usually with saliva, lube or other slipery substance, intercourse can be with a penis, dildo or other object of a similar shape, e.g. banana, cucumber etc, can be either male- male or male- female intercourse.
2. to be fucked hard up the ass, can be with a) a penis (the bigger the better), b) a dildo (the bigger the better) or other object of a similar shape e.g.  c) banana or d) cucumber, intercourse is usually fast and hard, feels damm good. can be using e) a lubricant of some kind (wet) or f) without and relying on the ass juices to provide sufficient lubrication (dry). common usage in the gay community.
ream
1. yo, he reamed me last nite.
2a. last nite i sucked his cock and then he fucked me in the ass, it fealt good.
b. last nite he sucked my dick, i sucked his and he shoved a dildo in my ass.
c. last nite we bought some big bananas and shoved them in each others ass holes.
d. last nite we wanted to do something different so i put some lube on my ass and he fucked me with a cucumber.
e. last nite he lubed up my ass and fucked me while stroking my dick.
f. last nite we didn't have any lube so he teased my ass with a dildo until my ass started juicing and then he fucked me hard.