I often see people use in twitter smth like「ｺﾞｸﾘ」, usually in the end of the sentence. What does it mean?
ゴクリ (ごくり) is an onomatopoeia for swallowing down something once, in this case, saliva (*gulp*). It is used to suggest that someone sees something "tasty", or holds breath expecting something. Written in halfwidth katakana in the end of a sentence because it is a long-standing format for short text elements in Japanese memes. While the onomatopoeia has many variants like ごくっ, ごっくり etc., I have only seen it in particular forms ｺﾞｸ or ｺﾞｸﾘ as internet slang.