Estragon (affectionately Gogo; he tells Pozzo his name is Adam) is one of the two main characters from Samuel Beckett's Waiting for Godot.
Estragon represents the impulsive, simplistic side of the two main characters, much in contrast to his companion Vladimir's careful intellectualism and verbosity.
Due to his pessimistic outlook on life, he has abandoned all hope of any alleviation from their suffering, and regards "Godot" suspiciously.
This boot focus (in terms of the character being foot centred) may be interpreted as being representative of his lower status (see Vladimir's hat) and his "earthy" nature (e.g. his love of carrots, radishes, etc.).
Estragon has a misanthropic view of humanity: he considers people to be "ignorant apes" and seems to want them to leave him alone.
This interpretation is best attributed to his total lack of restraint and inhibitions (diving for food, sleeping in ditches, etc.).