When the holiday of Halloween falls on a weekend (being a Friday, Saturday or Sunday), the entire weekend is then dubbed to be a Halloweekend. It may refer to the entire weekend being considered as one large, three night holiday.
When people on messageboards and forums discuss genetics and make memes about genetics that include PCA charts or haplogroups. Often such discussion is repetitive and engaged in by people who know little about the subject but will post genetics related images anyway, for example equating haplogroups with personality traits. Thus the term Haplomemes is appropriate. Additionally haplomeme discussion can be more insidious; sometimes users post meme images that accuse another ethnicity/nationality of having some sort of undesirable lineage in some way, for example memes that suggest South or East Europeans are non-European and thus less worthy.
*sigh* 'another Haplomemes thread.' 'You don't know anything about genetics, you just spamautistic haplomemes'
The weekend before Halloween (starting on Thursday and ending on Sunday or whatever day Halloween falls on). It do not matter what day of the week Halloween is because parties happen all weekend long. Halloweekends are usually at colleges where they party hard. Many people have multiple costumes for each night of Halloweekend.
James: Man, my professor scheduled an exam the Monday after Halloweekend.
Ryan: That sucks! I'll be partying hard all Halloweekend!