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1.
to thrum is the act of sticking ones thumb in anothers anal cavity and wiggling a little, either to pleasure or make a person very uncomfortable in your presense. Can be used intimately or as a form of socializing
Trevor and his boyfriend are thrumming enthusiasts and as a result both of them have loose bowels
by KingThrum August 31, 2008

Words related to thrum

anal hmm hum humm penetration soggy throb thrumm thumb
 
2.
A thrum is just between a throb and a hum. It's used to describe the throbbing hum produced by extremely loud, most likely live, music at an underground rave.
"Can you feel the thrum?"
by ateenangel August 09, 2006