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Titser means that the teacher has a nice rack. It is derived from the word Teacher. A teacher is to teach, as a titser is to tits. A titser uses her boobies to get the attention of the students, but the students are really paying attention to somewhere else (particularly the titser's tits).

Did you see the new titser in our math class? She is so hot!
by mike0913 April 02, 2008
A woman whose tits are very large and does not wear a bra so they jiggle and bounce for everyone to see. Also u can see her nipples.
Look at that woman, her tits are huge! And delicious!

Yeah dude, she's a titser.
by Skello194 June 13, 2013