It's pronounced 'teh'.It's a short vowel sound - like 'Ted' but without the 'd'.
www.urbandictionary.com/define.php?term=teh&r=f
(www.urbandictionary.com/define.php?term=teh&r=f
Mr. Tea dole-nonce-amuser extraordinaire,
Wed 18 Aug 2004, 16:34,
archived)