- Definition: Combination of two words (portmanteau)
- Portmanteau: portmanteau? + contraction
- Malapropism: portmanteau
Sources: Homestar Runner Wiki, XKCD Forums, user csours
Note: Technically a portmantraction might just be a grammatical error, not actually a portmanteau, since it uses portmanteau as the first part of it's portmanteau.
But it's still noteworthy in that it was used incorrectly in the place of portmanteau, and it clearly combines portmanteau and contraction.