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1.
A speculum is a device that allows one to gently open a body cavity (ie. the vagina or anus). It generally consists of two smooth spatulas which move apart when the handle is squeezed.
Billy used the 'speculum' to open Gary's anus.
by Jen November 13, 2003
 
2.
Anal or vaginal pry bar
The doctor put his speculum in my wife's cooch, so I told him to throw an extra stitch or 2 in for me when he was done

ass cave pry-bar
by Asscaver June 01, 2013
 
3.
to shit in an envelope and send it to someone.
"oh man, Tim sent me a speculum. gross"
by browni September 28, 2006