gobble
嗿 centers on eating greedily and noisily: to gobble food down in a hurried, voracious manner.
嗿 combines 口 (mouth) with 貪 (greedy), suggesting greedy eating with the mouth. The exact historical development is uncertain, but the component relationship is clear.
The left side is a mouth 口, and the right side is 貪 (greedy). Picture a greedy mouth gobbling food noisily.
For タン, imagine a tongue (タン) greedily gobbling food: the tongue cues タン while the mouth devours everything.