$_ = "wftedskaebjgdpjgidbsmnjgc";
tr/a-z/oh, turtleneck Phrase Jar!/; print;
       abcdefghijklmnopqrstuvwxyz
            |                |
            |                +- J
            +------------------ u
                                ..
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I've expanded the alphabet (a-z) and aligned it with the phrase it's being replaced with, to show you how the first two characters map. The first w maps to the J in Jar, the next f maps to the u in 'turtleneck', and so forth. Simple! :)