Google N-gram Corpus Counts
╭─ーーーーーー─┬────╮
│ 無駄メシ食い │ 72 │
│ 無駄メシ喰い │ 36 │
│ ムダメシ食い │ 24 │
│ むだめしぐい │ 37 │
╰─ーーーーーー─┴────╯

Noticed that I searched for はん instead of めし. No big difference.

Google N-gram Corpus Counts
╭─ーーーーーー─┬─────╮
│ 無駄飯食らい │ 371 │
│ 無駄飯喰らい │ 344 │
╰─ーーーーーー─┴─────╯

Jim said he's working on some new guidelines to clarify how we use metadata tags. In any case, the 喰 form here isn't remarkably uncommon.

isn't the policy to keep visible only forms in kokugos and/or popular enough?
not sure it's worth showing forms like -喰い, if it is [rK] seems appropriate here

〈無／む／ム〉〈駄／だ／ダ〉〈飯／はん／ハン〉〈食（い）／喰（い）／ぐい／グイ／くい／クイ〉

Google N-gram Corpus Counts
╭─ーーーーー─┬───────┬───────╮
│ 無駄飯食い │ 1,841 │ 80.1% │
│ ムダ飯食い │   195 │  8.5% │ - add, sK
│ 無駄飯喰い │   172 │  7.5% │
│ ムダ飯喰　 │    31 │  1.3% │
│ 無駄飯くい │    31 │  1.3% │
│ 無駄飯食　 │    29 │  1.3% │
╰─ーーーーー─┴───────┴───────╯

I don't think we currently have a policy for hiding forms like 無駄飯喰い

@@ -8,0 +9,3 @@
+</k_ele>
+<k_ele>
+<keb>ムダ飯食い</keb>

Google N-gram Corpus Counts
╭─ーーーーー─┬───────┬───────╮
│ 無駄飯食い │ 1,841 │ 91.5% │
│ 無駄飯喰い │   172 │  8.5% │
╰─ーーーーー─┴───────┴───────╯

@@ -5,0 +6,4 @@
+</k_ele>
+<k_ele>
+<keb>無駄飯喰い</keb>
+<ke_inf>&sK;</ke_inf>