what does this mean
 

This is currently coming up in my terminal is someone connecting to my computer?

Mar 31 22:10:01 jack kernel: ATTACKIN=ppp0 OUT= MAC= SRC=194.108.232.71 DST=203.220.166.156 LEN=78 TOS=0x00 PREC=0x20 TTL=109 ID=50001 PROTO=UDP SPT=1025 DPT=137 LEN=58
Mar 31 22:10:34 jack kernel: ATTACKIN=ppp0 OUT= MAC= SRC=81.1.13.213 DST=203.220.166.156 LEN=485 TOS=0x00 PREC=0x00 TTL=110 ID=49214 PROTO=UDP SPT=22981 DPT=1026 LEN=465
Mar 31 22:10:39 jack kernel: ATTACKIN=ppp0 OUT= MAC= SRC=211.162.48.240 DST=203.220.166.156 LEN=48 TOS=0x00 PREC=0x00 TTL=103 ID=5949 DF PROTO=TCP SPT=4620 DPT=139 WINDOW=16384 RES=0x00 SYN URGP=0
Mar 31 22:10:43 jack kernel: ATTACKIN=ppp0 OUT= MAC= SRC=211.162.48.240 DST=203.220.166.156 LEN=48 TOS=0x00 PREC=0x00 TTL=103 ID=6115 DF PROTO=TCP SPT=4620 DPT=139 WINDOW=16384 RES=0x00 SYN URGP=0

Hmm don't know : ATTACKIN

But if u want, install a firewall (iptable..)