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The slender vowel after the T palatalizes it, so it's pronounced like TYUH.
The fada over the 'o' designates that as the stressed syllable (and "o" in Irish is more like 'aw' than the English long 'o'), so MAW.
The slender vowel before the 'd' palatalizes that also, so it's DYUH, but lacking a following vowel makes the palatalization difficult, so it winds up being more like the 'j' in 'judge'.
So: tyuh-MAW-j.
As in so many such cases, this is the native Irish trying to pronounce a French name, in this case Timothée. (As 'John' goes to Séan and 'James' goes to Séamas.)

The fada elongates the vowel, it doesn't separate. So Tim-ODE. I have never met or heard of one (I am Irish).