A mental gauge that every man has that is used to measure the presence breasts in any situation. It may also be used to measure the quality of breasts.
-What is your titometer reading at?
"After the busty volleyball team got here, I think it may have broken. So I'd say the titometer is reading just past titillating."
-I am on my way!
2.
I liked that girl, but she barely affected the titometer.
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi