adverb
of course; naturally; obviously
Slangy, playful way to say 'of course', derived from 勿論 (もちろん). Used in casual conversation among friends.
See also: 勿論
「明日のパーティー、来る？」「もちのろん！」
"Are you coming to the party tomorrow?" "Of course!"
彼が手伝ってくれるのはもちのろんさ。
It goes without saying that he'll help out.
Standard, neutral word for 'of course'. もちのろん is a slangy, humorous variant.
A playful elongation of 勿論 (もちろん), splitting the word into もち and ろん and inserting の for humorous effect.