Other sound-imitative words
Sound-imitative words are also called "onomatopoeia" (象声词).
么么哒 
or 么么 — imitates the sound of a kiss.
Internet-slang 噗嗤 imitates the sound of a nervous laugh.
乜 describes the sound of a baby crying.
咕唧 or 咕咕唧唧 imitates the sound of a whisper, mutter or the sound of gurgling.
厮琅琅 imitates the sound of a bell ringing or vibration.
锳 also imitates the sound of a bell.
湛湛 describes the sound of waves roaring.
咕噜 and 咕噜咕噜 have several meanings. They imitate:
1) water gurgling or gulping: "gulp";
2) stomach rumbling;
3) murmuring, mumbling;
4) the sound of things rolling down. For example, stones rolling down a mountain.
or 么么 — imitates the sound of a kiss.
Internet-slang 噗嗤 imitates the sound of a nervous laugh.
乜 describes the sound of a baby crying.
咕唧 or 咕咕唧唧 imitates the sound of a whisper, mutter or the sound of gurgling.
厮琅琅 imitates the sound of a bell ringing or vibration.
锳 also imitates the sound of a bell.
湛湛 describes the sound of waves roaring.
咕噜 and 咕噜咕噜 have several meanings. They imitate:
1) water gurgling or gulping: "gulp";
2) stomach rumbling;
3) murmuring, mumbling;
4) the sound of things rolling down. For example, stones rolling down a mountain.