A fork of Rural Dictionary
When someone enters a conversation by blurting something which they think is funny or appropriate to the conversation, but which completely kills the previously enjoyable conversation.
Example 1: Person 1: You slagging me!? Person 2: Yeah! And!? Person 1: Do you wanna fight!? Person 3: Ooh, shit's going down! (Person 1 and Person 2 leave because of Person 3's un-deahlifying comment). Example 2: Person 1: Story, lads!? Person 2: Awh, deahly like, wha!? Person 3: Hello, guys. (Person 3 has just un-deahlified the conversation).