Since this word consists of a kanji with hiragana attached, you can bet that it will use the kun'yomi reading. You didn't learn that reading with this kanji, so here's a mnemonic to help you:
If you want to shout at someone you should pick a word that will really hit them. Give them a big whammy (わめ) to the face! Hey, that word works. Shout WHAMMY!
A drunk guy is shouting.