Gerund functioning as an uncountable noun referring to the sound or act of sizzling.
Definitions
The hissing sound or the act of something sizzling. The loud sizzling of the bacon made her mouth water.
sizzlegerund / present participle Used attributively to describe something emitting a hissing sound or extremely hot/exciting
Definitions
Emitting a hissing sound as if frying; extremely hot or exciting. We stepped into the sizzling desert afternoon.