Surprisingly, this is actually a word! OED says "A scramble, confused struggle" for the noun form; for the verb form, "To struggle with others for money, fruit, sweetmeats, etc. lying on the ground or thrown to a crowd; hence, to struggle in an indecorous and rapacious manner in order to obtain something." So your thwartmanteau is pretty close, uselessness. :-)
Surprisingly, this is actually a word! OED says "A scramble, confused struggle" for the noun form; for the verb form, "To struggle with others for money, fruit, sweetmeats, etc. lying on the ground or thrown to a crowd; hence, to struggle in an indecorous and rapacious manner in order to obtain something." So your thwartmanteau is pretty close, uselessness. :-)
noun. The overconfident stride of a man who wants to take your money.