expression
that's so true; exactly right
Casual slang abbreviation of ほんまそれ (Kansai) or 本当にそれ, used to strongly agree with someone's statement. Common in online chat and informal conversation.
「このラーメン、めっちゃうまいな」「ほんそれ！」
"This ramen is super good." "So true!"
「あの映画、泣けるよね」「ほんそれ。何回見ても泣く」
"That movie makes you cry, right?" "Exactly. I cry every time I watch it."