To curl out a turd (or a 'log' as it's sometimes known) on an unsuspecting victim's head. The loggerhead is best achieved when said victim is asleep.
''While sandra was asleep, her boyfriend Joe, did gone and gave her a big ol' loggerhead.''
''What's a loggerhead?''
''I'm glad you asked. It's basically shitting on someones forehead''
''Well this has been educational. Thanks!''
''You're extremely welcome, Betty.''
or...
''God, Sandra is such a cunt sometimes!''
''I agree, Joe. Shall we give her a loggerhead as punishment?''
''Yes. Then we should steal from her.''
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