Samson Da Barbarian is a character in the Bible who fought the Philistines. Apparently, he gets his strength from his hair. He got mad over his wife being taken away, and stopped oppression that God himself caused. He also killed a lion. Samson fell in love with a woman called Delilah who cut his hair while Samson was asleep. Then Samson lost his strength because he was a Nazirite, see below and Nazirites aren't supposed to cut their hair. His enemies then blinded Samson and made do humiliating work. When Samson's hair grew back his strength returned. In the end Samson committed Suicide by pulling down pillars which killed Samson and also very many Philistines.
The Philistines were a group of people Samson fought against in the Bible. Samson wanted to marry a Philistine woman, but she told them the answer to a riddle Samson gave. He still wanted her anyway, and this lead to him burning the Philistines' crops. He became a fugitive after this.
Three restrictions are imposed upon the Nazarite, according to Num. vi.: he may not take wine, or anything made from grapes; he may not cut the hair of his head; he may not touch the dead, not even the body of his father or mother. (...) Samson was a Nazarite, whose mother abstained from wine during her pregnancy. His superhuman strength lay in his long, unshorn locks (Judges xiii. et seq.). Samuel's mother promised to dedicate him to God during his whole life, saying, "There shall no razor come upon his head" (I Sam. i. 11); the Septuagint concludes from the latter promise (to which it adds "he shall drink no wine") that Samuel was a Nazarite. 
A Nazirite is a child or adult who is bound to God by their hair and other restrictions. Some Nazarites took the vow for a fixed period, others for life.