on the meaning of the verb to hump

sinead circulated a late night note among some about how she was confused about the film starring keanu reeves and sandra b_____ -- she thought bernhardt not bullock and mused about how alarming (or hilarious?) it would be to see sandra bernhardt have her way with keanu at a lake house.

and sinead also expressed her affinity to madeline's wit and writing style. come to think of it, perhaps miss madeline should have been conducting the writing circle last night in-class? or perhaps the birthday boy bateman (a.k.a. daddy) should have been because he is way funny. funny with sound fx, flash + everything.

and to further clarify, it is madeline--not mike--who is led around on a leash and likes to hump others while eyeing squirrels and birds.