Strong’s concordance:
1) to be moved as to one’s bowels, hence to be moved with compassion, have compassion (for the bowels were thought to be the seat of love and pity)
It means a visceral wrenching of the gut - it does
not mean anger, though it is much stronger than simply “moved”.
The link has a list of all the times in the Bible the particular word is used - if you read them, you’ll see that “anger” is not a supportable definition of the Greek word ‘splagchnizomai’
; it is, however, the correct definition of ‘orgistheis’, which is used in some textual variants (though none which are endorsed by the Church, as far as I know).
I’m sure your pastor meant well, but his Greek needs a little bit of brushing-up - that, or he should warn people that he’s exegeting in accordance with a minor textual variant.
God Bless,
RyanL