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2.
Dextrose content of a (chemical) solution, including blood. Also a pun on dexterity, due to non-intrusive blood sugar monitoring devices which are essentially looking for the glucose content of blood (dextrose is also known as d-glucose) by shining light through one's finger.
A: "I have been feeling very feint lately."

B: "Maybe you have low blood sugar, go get a blood test."

A: "But I am afraid of needles."

B: "Then get a dextrosity check, you pussy."
by minagica April 10, 2011
 
1.
Used when describing music that is toxic because of excessive dexterous technique. It relates to "monstrosity" and "dexterous"
That band are an absolute dextrosity!
by spoonfedbutangry August 28, 2010